Answer
The $\text{sine}$ of $t$ is the $y$-coordinate of the point P$\left( x,y \right)$ on the unit circle. Thus, $\sin t=y$.
Work Step by Step
See below:
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 4.2 - Trigonometric Functions: The Unit Circle - Exercise Set - Page 549: 86
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