Evaluate
\frac{2\pi }{3}\approx 2.094395102
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\frac{\pi }{2}+\frac{\pi }{6}
Combine x and -x to get 0.
\frac{2}{3}\pi
Combine \frac{\pi }{2} and \frac{\pi }{6} to get \frac{2}{3}\pi .
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