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5.6 Transformations of the Sine and Cosine Graphs Wed Nov 12 Do Now Use the sine and cosine values of 0, pi/2, pi, 3pi/2 and 2pi to sketch the graph of.

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Presentation on theme: "5.6 Transformations of the Sine and Cosine Graphs Wed Nov 12 Do Now Use the sine and cosine values of 0, pi/2, pi, 3pi/2 and 2pi to sketch the graph of."— Presentation transcript:

1 5.6 Transformations of the Sine and Cosine Graphs Wed Nov 12 Do Now Use the sine and cosine values of 0, pi/2, pi, 3pi/2 and 2pi to sketch the graph of f(x) = sin x and g(x) = cos x

2 Review of graphs Y = sin x Period of 2pi Amplitude of 1 Goes through (0, 0)

3 Review of Graphs Y = cos x Period of 2pi Amplitude of 1 Goes through (0, 1)

4 Transformations We are interested in the graphs of functions in the form

5 The Constant A Recall that coefficients of functions result in a vertical shift / shrink The constant A affects the amplitude of sine and cosine. The amplitude = A If A is negative, the graph is upside down

6 Ex Graph the following 1) 2) 3)

7 The Constant B Recall that coefficients of X result in a horizontal stretch / shrink The constant B affects the period The period of these graphs is

8 Ex Sketch a graph of the following 1) 2)

9 The Constant C The constant C, like in previous functions, results in a horizontal shift C units right / left This is also known as a phase shift Ex: sin (x – 4) is a shift to the right 4 units Cos (x + pi) is a shift to the left pi units

10 The Constant D The constant D results in a vertical shift D units up / down Ex: y = sin x + 1 shifts up 1 unit Ex: y = cos x – 4 shifts down 4 units Notice no parenthesis

11 Combined Transformations When working with multiple transformations, we want to rewrite the functions This helps you see the phase shift

12 How to graph 1) determine the period, amplitude, and shifts 2) graph and shift the period, and split it into 4 regions 3) plot a point in between each region, including the amplitude and shifts in your calculations 4) connect the points in the correct sine or cosine wave

13 Ex Sketch a graph of

14 Ex Sketch a graph of

15 Closure Graph HW: p.523 #1-25 odds

16 5.6 Transformations of Sine and Cosine cont’d Thurs Nov 13 Do Now Graph the following 1) y = sin(1/2 x)] 2) y = - 2cos( 2x )

17 HW Review: p.523 #1-25 odds

18 Review of Sine and Cosine Recall the transformations A affects the amplitude B affects the period C/B affects the phase shift D affects the vertical shift

19 Ex Graph

20 Matching On p.522

21 Closure What kind of transformations can affect the sine and cosine graphs? How do we determine what transformations occur? HW: p.523 #27-43 odds

22 5.6 Addition and Multiplication of Ordinates Fri Nov 14 Do Now Graph

23 HW Review: p.523 #27-43

24 Graphs of Sums: Additions of Ordinates When graphing a sum of 2 trigonometric functions, we use a strategy called addition of ordinates

25 Properties of sums The period of a sum will be the least common multiple of every period Graph each important point by adding the y- values of each trig function

26 ex Graph y = 2sin x + sin 2x

27 Damped Oscillation: Multiplication of Ordinates We’ll just graph these

28 Finding zeros (review) To find zeros of a function, 1) Graph function 2) 2 nd -> calc -> zeros 3) Left bound – pick a point slightly left of the zero you want 4) Right bound – pick a point slight right of the zero you want 5) Guess – hit enter

29 ex Solvethe zeros ofon the interval [-12,12]

30 closure What is addition of ordinates? How do we graph these functions? HW: p.524 #45-73 odds

31 5.6 Other Trig Transformations Mon Nov 17 Do Now Graph y = csc x and y = tan x on your calculator

32 HW Review: p.524 #45-73 odds

33 Review: f(x) = tan x and cot x The period of tangent and cotangent is pi Each period is separated by vertical asymptotes Amplitude does not affect the graph drastically

34 Basic graphs Y = tan xy = cot x

35 Review: f(x) = csc x and sec x The period of csc x and sec x is 2pi Vertical asymptotes occur every half period The amplitude represents how close to the center each curve gets

36 Basic Graphs Y = csc x y = sec x

37 Transformations Transformations affect these 4 graphs the same way

38 Ex Sketch the graph of

39 Ex Sketch the graph of

40 Closure Graph HW: p. 525 #89-97 odds CH 5 Test soon

41 5.6 Review Tues Nov 18 Do Now Sketch the graph of

42 HW Review p.525 #89-97

43 Transformations Review Basic graphs Transformations Period, Amplitude, Phase shift, Vertical shift

44 Closure What are some identifying properties of trigonometric functions and their graphs? HW: p.529 #1-83 odds skip due Thursday SGO Assessment Wed Nov 19 Ch 5 Test Fri Nov 21


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