DEPRECATED Unit circle trigonometry

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Problem

The graph below contains the unit circle and the rays and .
forms an angle with the positive x-axis, which is congruent to the angle formed by and the positive y-axis. The measures of both angles are labeled as theta.
Which expression equals sine, left parenthesis, theta, right parenthesis?
The y-coordinate of point(s)
Select all that apply.
Select all that apply.