Answer
$\pi-\frac{\pi}{4}$
Work Step by Step
We know that $\frac{3\pi}{4}=\pi-\frac{\pi}{4}$, because $\pi-\frac{\pi}{4}=(1-\frac{1}{4})\pi=(\frac{3}{4})\pi=\frac{3\pi}{4}$.
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