Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 6 - Review - Exercises - Page 529: 56

Answer

$sin\theta=-\frac{12}{13}$, $cos\theta=-\frac{5}{13}$, $tan\theta=\frac{12}{5}$, $cot\theta=\frac{5}{12}$, $csc\theta=-\frac{13}{12}$, $sec\theta=-\frac{13}{5}$

Work Step by Step

Step 1. Given $sec\theta=\frac{1}{cos\theta}=-\frac{13}{5}$ and $tan\theta\gt0$, we can identify that $\theta$ is in Quadrant III. Step 2. From the above given condition, we get $cos\theta=-\frac{5}{13}$, Step 3. Similarly, $sin\theta=-\sqrt {1-cos^2\theta}=-\frac{12}{13}$ and $csc\theta=\frac{1}{sin\theta}=-\frac{13}{12}$ Step 4. Use the results above $tan\theta=\frac{sin\theta}{cos\theta}=\frac{12}{5}$ and $cot\theta=\frac{1}{tan\theta}=\frac{5}{12}$
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