# Chapter 14 Trigonometric Graphs, Identities, and Equations - Chapter Test - Page 969: 2

The graph is attached.

#### Work Step by Step

Sometimes, the given functions were sine and cosine functions in the form $y=asin(bx)$ and $y=acos(bx)$. Note, the only difference between sine and cosine functions is that, when not shifted, cosine functions are at their maximum amplitude at $x=0$, while sine functions are at $0$ at this point. Note, $\mid a\mid$ is the amplitude of the functions, and $\frac{2\pi}{b}$ is the period of these functions. However, the functions also can be shifted by $h$ units to the right and $k$ units up, as noted on page 915. Recall, it is necessary to pay attention to the sign of $h$ and $k$. (Do not forget that there is a negative in front of $h$!)

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