## Trigonometry (11th Edition) Clone

RECALL: The function $y=a \cdot \cos{x}$ has: period = $2\pi$ amplitude = $|a|$ The given function has $a=-2$. Thus, it has: period = $2\pi$ amplitude = $|-2|=2$ (which means that the values of the function vary from $-2$ to $2$ One period of this function is in the interval $[0, 2\pi]$. Divide this interval into four equal parts to obtain the key x-values $0, \frac{\pi}{2}, \pi, \frac{3\pi}{2}, 2\pi$. To graph the given function, perform the following steps: (1) Create a table of values using the key x-values listed above. (Refer to the table below.) (2) Plot the points from the table of values and connect them using a sinusoidal curve. (Refer to the graph in the answer part above.)