# 4 5 Graphs of Sine and Cosine Functions

• Slides: 18

4. 5 Graphs of Sine and Cosine Functions Amplitude Period Translations

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 is an even function

The red graph is Sin and the blue is Cos

Amplitude changes the Range

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 2 x b = 2

Translation to move the graph of the function y = 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

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