Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 6 - Trigonometric Functions - 6.2 Trigonometric Functions: Unit Circle Approach - 6.2 Assess Your Understanding - Page 379: 83

Answer

$sin(\theta) =\frac{3}{5}$, $cos(\theta) =\frac{4}{5}$, $tan(\theta) =\frac{3}{4}$, $cot(\theta) =\frac{4}{3}$, $sec(\theta) =\frac{5}{4}$, $csc(\theta) =\frac{5}{3}$.

Work Step by Step

We can multiply the coordinates with $12$ to get another point on the same terminal $x=4,y=3$, the terminal side is in quadrant I with $r=\sqrt {x^2+y^2}=5$, we have: $sin(\theta)=\frac{y}{r}=\frac{3}{5}$, $cos(\theta)=\frac{x}{r}=\frac{4}{5}$, $tan(\theta)=\frac{y}{x}=\frac{3}{4}$, $cot(\theta)=\frac{x}{y}=\frac{4}{3}$, $sec(\theta)=\frac{r}{x}=\frac{5}{4}$, $csc(\theta)=\frac{r}{y}=\frac{5}{3}$.
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