Answer
See the graph of the function below.
$$f(\theta)=\cos \left(2 \theta-\frac{\pi}{2}\right),\ \ \ \theta\in[0,\pi/2]$$
Work Step by Step
$$f(\theta)=\cos \left(2 \theta-\frac{\pi}{2}\right),\ \ \ \theta\in[0,\pi/2]$$
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