Answer
From the figure we have $y=sin\theta$.
For both the points, the y-coordinates are same.
Hence, $sin(180^{\circ}-\theta)=sin\theta$.
Work Step by Step
From the figure we have $y=sin\theta$.
For both the points, the y-coordinates are same.
Hence, $sin(180^{\circ}-\theta)=sin\theta$.
