Answer
$\frac{3\pi}{4}$
Work Step by Step
$\frac{5\pi}{4}-\frac{\pi}{2}=\frac{5\pi}{4}-\frac{\pi\times2}{2\times2}=\frac{5\pi}{4}-\frac{2\pi}{4}=\frac{5\pi-2\pi}{4}=\frac{3\pi}{4}$
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