Answer
$$y= \sin \theta.$$
Work Step by Step
The unit circle definition of $\sin \theta $ is that
$$y=r\sin \theta=\sin \theta,$$
where the radius $r=1$.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 1 - Precalculus Review - 1.4 Trigonometric Functions - Preliminary Questions - Page 29: 5
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