Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 5 - Trigonometric Functions - 5.2 Trigonometric Functions - 5.2 Exercises - Page 520: 139

Answer

$\tan\theta=-\frac{15}{8}$ $\cot\theta=-\frac{8}{15}$ $\sec\theta=-\frac{17}{8}$ $\cos\theta=-\frac{8}{17}$ $\sin\theta=\frac{15}{17}$ $\csc\theta=\frac{17}{15}$

Work Step by Step

$\tan\theta=-\frac{15}{8}$ $\cot\theta=\frac{1}{\tan\theta}=-\frac{8}{15}$ Recall that $\tan^{2}\theta+1=\sec^{2}\theta$ $\implies\sec^{2}\theta=(-\frac{15}{8})^{2}+1=\frac{289}{64}$ $\sec\theta=\pm\sqrt {\frac{289}{64}}=-\frac{17}{8}$ ($\sec\theta\lt0$ in quadrant II) $\cos\theta=\frac{1}{\sec\theta}=-\frac{8}{17}$ $\sin\theta=\tan\theta\cos\theta=-\frac{15}{8}\times-\frac{8}{17}=\frac{15}{17}$ $\csc\theta=\frac{1}{\sin\theta}=\frac{17}{15}$
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