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4.5 Graphs of Sine and Cosine Functions AmplitudePeriodTranslations
The graph of f(x)=sin x Domain all Real numbers Range -1 to 1
The graph of f(x)=sin x Sin x is an odd function
Graph of f(x) = -sin x
Graph of the f(x) = Cos x Domain: All real numbers Range: -1 to 1
Graph of the f(x) = Cos x Cos x is an even function
The red graph is Sin and the blue is Cos
Amplitude changes the Range
Since Amplitude is a distance, it is always positive. To find it: the absolute value of the Maximum minus the Minimum divide by two. Amp is written before the function y = a*sin x
Amplitude changes the Range Max 7; Min - 1 Amp.
Period (wave length) The distance before the function repeats its value. y = sin bx; here b is 1.
Period (wave length) y = sin 2x b = 2
Translation to move the graph of the functiony = sin (x + c): moves Right or Left Here is
Translation to move the graph of the functiony = sin x + d moves up or down Here is
With all the translations The sine function is f(x) = d + a sin b(x +c) The cosine function is f(x) = d + a cos b(x +c)
Applet for the Sine function http://www.analyzemath.com/trigonometry/ sine.htm
Homework Page 307 – 310 #3, 9, 14, 20, 26, 32, 41, 49, 71, 78
Homework Page 307 – 310 #7, 12, 17, 23, 27, 36, 45, 60, 76, 86
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This is the graph of y = sin x o The maximum value of sin x o is 1 The minimum value of sin x o is -1 Amplitude = 1 We say the period of y = sin x o is.
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