Answer
$\frac{y}{r}$.
$\frac{x}{r}$.
Work Step by Step
1. $sin\theta=\frac{opposite\ side}{hypotenuse}=\frac{y}{r}$.
1. $cos\theta=\frac{adjacent\ side}{hypotenuse}=\frac{x}{r}$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 5 - Trigonometric Functions - Section 5.2 Trigonometric Functions: Unit Circle Approach - 5.2 Assess Your Understanding - Page 402: 11
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