Answer
$\pi-\frac{\pi}{3}$
Work Step by Step
We know that $\frac{2\pi}{3}=\pi-\frac{\pi}{3}$, because $\pi-\frac{\pi}{3}=(1-\frac{1}{3})\pi=(\frac{2}{3})\pi=\frac{2\pi}{3}$.
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