## Trigonometry (11th Edition) Clone

Published by Pearson

# Chapter 4 - Graphs of the Circular Functions - Section 4.1 Graphs of the Sine and Cosine Functions - 4.1 Exercises - Page 149: 40

#### Answer

Refer to the graph below #### Work Step by Step

RECALL: The functions $y=a \cdot \sin{bx}$ and $y=a \cdot \cos{bx}$ have: period = $\dfrac{2\pi}{b}$ amplitude = $|a|$ The given function has $a=-\pi$ and $b=\pi$ thus period = $\dfrac{2\pi}{\pi}=2$ amplitude = $|-\pi| = \pi$ To graph the function, perform the following steps: (1) With a period of $2$, one period of the function is over the interval $[0, 2]$. (2) Divide this interval into four parts to obtain the x-values $0, \frac{1}{2}, 1, \frac{3}{2}, \text{ and } 2$. (3) Make a table of values using the x-values above. (Refer to the table below.) (4) Plot the five points of the table of values then connect them using a sinusoidal curve whose amplitude is $\pi$. (5) Repeat the cycle of the graph form one more period, which is $[2, 4]$. (Refer to the graph in the answer part above.) After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.