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Published byEddie Hibbitt Modified over 2 years ago

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Author: Kyle Heffelbower

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Trigonometric functions- sine, cosine, and tangent Sine is abbreviated sin Cosine is abbreviated cos Tangent is abbreviated tan The Greek letter theta (Θ) is used as a variable for angles. Hypotenuse is the side opposite the right angle in a right triangle. The longest side of a right triangle.

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For any RIGHT triangle the trigonometric ratios allow us to find out information about the side lengths and angle measures when given some basic information

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The sine of an angle for a right triangle, is equivalent to the ratio of an opposite side and hypotenuse Opposite side with respect to theta Adjacent side with respect to theta Hypotenuse Θ

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The cosine of an angle for a right triangle, is equivalent to the ratio of an adjacent side and hypotenuse Opposite side with respect to theta Adjacent side with respect to theta Hypotenuse Θ

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The tangent of an angle for a right triangle, is equivalent to the ratio of an opposite side and the adjacent side Opposite side with respect to theta Adjacent side with respect to theta Hypotenuse Θ

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All of these relationships can easily be remembered with the acronym

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Now that we have done a bit of review, let’s get some practice in before we get to the new stuff.

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Choose the best answer for the length of the h given the right triangle below. h 13 meters 50° a meters correct b meters cos c meters rad d meters divide

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Nice job recognizing that it is a right triangle and you need to use sine to complete it, but it is the opposite side divided by the hypotenuse- not the other way around. Let’s take another look

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Let’s take another look at the trigonometric ratios and try this out again. Make sure you are identifying the sides accurately. Let’s try this again!

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Way to go champion!! Keep up the good work.

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Choose the best answer for the length of the h given the right triangle below. x 8 meters 38° a meters divide b meters correct c meters sin d meters rad

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Nice job recognizing that it is a right triangle and you need to use cosine to complete it, but it is the adjacent side divided by the hypotenuse- not the other way around. Let’s take another look

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Let’s take another look at the trigonometric ratios and try this out again. Make sure you are identifying the sides accurately. Let’s try this again!

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Way to go champion!! Keep up the good work.

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Choose the best answer for the length of the h given the right triangle below. h 3 meters 24° a meters b meters c meters d meters

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Nice job recognizing that it is a right triangle and you need to use tangent to complete it, but it is the opposite side divided by the adjacent- not the other way around. Let’s take another look

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Let’s take another look at the trigonometric ratios and try this out again. Make sure you are identifying the sides accurately. Let’s try this again!

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Way to go champion!! Keep up the good work.

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Now that we are caught up to speed in the review of the solving trigonometric ratios, it is time to get to the graphing.

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A ride maker decides to crank up the intensity of the “Megaloop.” She wants to place half of it underground. Always conscious of safety and evacuation necessities she has called on you to discover the distance from the ground at any point on this loop. See if you can help her out. Job one: Let’s get a picture of the scenario.

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Draw a circle to fit the ride. Next draw a rectangle to model the “underground” portion of the ride. Now, to get a sense of this let’s create axes. Last, let’s identify the radius of this circle. Nice drawing!!

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Just for ease of calculation let’s call the radius 1 unit long. Calling the radius 1 unit long gives us a great model of a common mathematical model named the (1 unit radius= unit circle) y x 1 Unit Circle

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As with our evacuation route for the half underground Megaloop, the goal is to find the distance from the ground. In the picture this is the vertical distance from the x-axis. y x 1 y

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Time to calculate the evacuation distance. For the ride. If you need help just call on Pythagoras. y x 1 y Θ

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For the next activity you will need a scientific calculator in degree mode. We will take a look at several different right triangles developed from various angles and build a table of values. Let’s get cracking!!

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Find the height at 30 degrees. cos cos tan tan 0.5 correct 0.5 correct radians radians y x y 30° 1

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Great work calculating that distance. Let’s put that on the table and continue!! Bring on the next one!!

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height0.5 Find the height at 45 degrees. radi radi correc correc 1 tan 1 tan cos cos y x y 45° 1

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Nice job putting that together. Let’s put that on the table and continue!! Bring on the next one!!

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 60 degrees. 0.5 cos 0.5 cos correc correc radi radi tan tan y x y 60° 1

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Distance is just right. Let’s put that on the table and continue!! Bring on the next one!!

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 90 degrees. radi radi 1 correc 1 correc undefined undefined 0 cos 0 cos y x y 90° 1

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Let’s put that on the table and continue!! Bring on the next one!!

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 120 degrees. radi radi -0.5 cos -0.5 cos tan tan correct correct y x y 120° 1

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Let’s put that on the table and continue!! Bring on the next one!!

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 150 degrees. radi radi cos cos tan tan 0.5 correct 0.5 correct y x y 150° 1

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Are you beginning to sense a bit of a pattern? Let’s put that on the table and continue!! Bring on the next one!!

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 180 degrees. 1 cos 1 cos radi radi Undefined arithmeti Undefined arithmeti 0 correct 0 correct y x 180°

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Keep on trucking!! Finish this up. Bring on the next one!!

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 210 degrees. -0.5 correct -0.5 correct cos cos tan tan radin radin y x y 210° 1

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 240 degrees. tan tan rad0.945 rad corredc corredc -0.5 cos -0.5 cos y x y 240° 1

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 270 degrees. radi radi -1 correc -1 correc undefined undefined 0 cos 0 cos y x y 270°

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 300 degrees. 0.5 cos 0.5 cos correc correc radi radi tan tan y x y 300° 1

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 330 degrees. -0.5 correct -0.5 correct cos cos tan tan radin radin y x y 330° 1

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Angle Height Find the height at 360 degrees. 1 cos 1 cos radi radi Undefined arithmeti Undefined arithmeti 0 correct 0 correct y x 360°

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Remember our Trigonometric ratios and think about what we were given.

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While your idea is flawless and you did correctly solve this, you did it for radians and not degrees. There are two popular ways to measure angles- degrees is one, radians is the other Whenever you are working with trigonometric functions- sine, cosine, tangent- you need to make sure your calculator is in the right MODE Help with switching you calculator Try again

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For the TI-81 through TI-84 the radian/degree shift is in the “mode” menu. The button is next to the 2 nd key. For the TI-nSpire the radian/degree shift is in the general settings menu Many scientific calculators have a units shift button. On the screen it will say either “deg” or “rad” in little letters.

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Whew!! Now that we have created a great table we need to graph it. But first… Look back at your calculations. Did you notice any commonalities? Nope. I did not recognize nuttin’. Nope. I did not recognize nuttin’. Now that you mention it, I do notice that we did a lot of sine of the angle. Now that you mention it, I do notice that we did a lot of sine of the angle. Uh- duh?! Of course! We did the same trigonometric ratio every single time. In fact, I stopped writing it out after the first four because I am awesome! Uh- duh?! Of course! We did the same trigonometric ratio every single time. In fact, I stopped writing it out after the first four because I am awesome!

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Look closely at each of the times you calculated the height. Every single time you were given an angle, the hypotenuse and you needed to find the opposite side. Angle… opposite… hypotenuse Let’s try that question again.

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Good job recognizing the pattern!! This means that ANYTIME you need to find ANY height for ANY Megaloop evacuation you will ALWAYS use sin(Θ) Let’s get graphing this!!

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Now that we have a table we can create the graph.

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Angle Height

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You have just created your first graph of a trigonometric function. This wave function you created is the graph of f(x)= sin(x). This is the parent equation for the sinusoidal family of functions. We used the unit circle to generate this graph. This means that for the Super Megaloop designer who wants to place half of the ride underground. She simply needs to remember sin(x) to know all the evacuation heights!!

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This wave function lends itself to many real world uses. Pendulums, light, sound, and most circle motion can be graphed by these wave functions. Specific features and transformations will be discussed later.

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The unit circle is a circle whose radius is one unit and can be utilized to look at trigonometric functions y x 1 That led us to building right triangles throughout which gave us a table of heights. Angle Height We noticed that while creating these heights we ALWAYS simplified to… And this built a unique family of functions that look like waves. Restart from Beginning

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