Answer
See explanations.
Work Step by Step
Given a point $(x,y)$ on the terminal side of angle $\theta$, we have $r=\sqrt {x^2+y^2}$ and by definition, we can find $sin\theta=\frac{y}{r}$.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.4 - Trigonometric Functions of Any Angle - Exercise Set - Page 576: 105
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