Evaluate
\frac{\pi }{4}\approx 0.785398163
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\frac{\pi }{12}+\frac{\pi }{6}
Combine x and -x to get 0.
\frac{1}{4}\pi
Combine \frac{\pi }{12} and \frac{\pi }{6} to get \frac{1}{4}\pi .
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