Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 1 - Review Exercises: 45


$\sin\theta=\frac{y}{r}=\frac{-3}{5}$ $\cos\theta=\frac{x}{r}=\frac{4}{5}$ $\csc\theta=\frac{r}{y}=\frac{5}{-3}$ $\sec\theta=\frac{r}{x}=\frac{5}{4}$ $\tan\theta=\frac{y}{x}=\frac{-3}{4}$ $\cot\theta=\frac{x}{y}=\frac{4}{-3}$

Work Step by Step

From secant and quadrant we know that $x=4; r=5$, so lets find x: $x^{2}+y^{2}=r^{2}$ $4^{2}+y^{2}=5^{2}$ $y^{2}+16=25$ $y^{2}=9$ (since $y\lt0$ in IV quadrant) $y=-3$
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