Precalculus (6th Edition)

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

Chapter 5 - Trigonometric Functions - Chapter 5 Test Prep - Review Exercises - Page 559: 14

Answer

$-\frac{2\sqrt {85}}{85}, \frac{9\sqrt {85}}{85}, \frac{-2}{9}, -\frac{9}{2}, \frac{\sqrt {85}}{9}, -\frac{\sqrt {85}}{2}$

Work Step by Step

Given point $(9,-2)$ on the terminal side, we have: 1. $sin\theta=\frac{-2}{\sqrt {(9)^2+(-2)^2}}=-\frac{2}{\sqrt {85}}=-\frac{2\sqrt {85}}{85}$ 2. $cos\theta=\frac{9}{\sqrt {(9)^2+(-2)^2}}=\frac{9}{\sqrt {85}}=\frac{9\sqrt {85}}{85}$ 3. $tan\theta=\frac{-2}{9}$ 4. $cot\theta=\frac{1}{tan\theta}=-\frac{9}{2}$ 5. $sec\theta=\frac{1}{cos\theta}=\frac{\sqrt {85}}{9}$ 6. $csc\theta=\frac{1}{sin\theta}=-\frac{\sqrt {85}}{2}$
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