Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 4 - Review Exercises - Page 646: 88

Answer

See the graph below:

Work Step by Step

The two consecutive asymptotes occur at $\frac{\pi }{2}x=0\text{ and }\frac{\pi }{2}x=\pi $. By solving $\frac{\pi }{2}x=0$ to get $\begin{align} & \frac{\pi }{2}x=0\text{ } \\ & x=0\text{ } \\ & x=0\text{ } \end{align}$ Again, solve $\frac{\pi }{2}x=\pi $ to get $\begin{align} & \frac{\pi }{2}x=\pi \\ & x=\pi \cdot \frac{2}{\pi } \\ & x=2 \end{align}$ Now, the x-intercept is in between the two consecutive asymptotes. Therefore, the x-intercept is given as follows: $\begin{align} & x\text{-intercept = }\frac{0+2}{2} \\ & =\frac{2}{2} \\ & =1 \end{align}$ Thus, the graph passes through $\left( 1,0 \right)$ and the x-intercept is $1$. As the coefficient of the provided cotangent function is $-\frac{1}{2}$, the points on the graph midway between the x-intercept and the asymptotes have y-coordinates of $-\frac{1}{2}$ and $\frac{1}{2}$. We use the two consecutive asymptotes, $x=0$ and $x=2$ , to graph one full period of $y=-\frac{1}{2}\cot \frac{\pi }{2}x$ from $0\text{ to }2$.
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