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: 22

Answer

$-\frac{12}{13}, \frac{5}{13}, -\frac{12}{5}, -\frac{5}{12}, \frac{13}{5}, -\frac{13}{12}$

Work Step by Step

1. Graph $12x+5y=0, x\geq0$ and the least positive angle $\theta$ as shown. We can identify a point $(5,-12)$ on the line. 2. $sin\theta=\frac{-12}{\sqrt {(5)^2+(-12)^2}}=-\frac{12}{13}$ 3. $cos\theta=\frac{5}{\sqrt {(5)^2+(-12)^2}}=\frac{5}{13}$ 4. $tan\theta=\frac{-12}{5}=-\frac{12}{5}$ 5. $cot\theta=\frac{1}{tan\theta}=-\frac{5}{12}$ 6. $sec\theta=\frac{1}{cos\theta}=\frac{13}{5}$ 7. $csc\theta=\frac{1}{sin\theta}=-\frac{13}{12}$
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