Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Appendix D - Trigonometry - D Exercises - Page A33: 68


$\frac{\pi}{4},\frac{3\pi}{4},\frac{5 \pi}{4}\frac{7 \pi}{4}$

Work Step by Step

Need to find the range for $x$ for the equation $|tanx|=1$ $tanx=±1$ Since, $tanx>0$ on first and third quadrant and $tanx<0$ on second and fourth quadrant, thus, x must lie on $\frac{\pi}{4},\frac{3\pi}{4},\frac{5 \pi}{4}\frac{7 \pi}{4}$
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