Evaluate
-\frac{11\pi }{6}\approx -5.759586532
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-\pi -\frac{5}{6}\pi
Combine -\pi and \frac{\pi }{6} to get -\frac{5}{6}\pi .
-\frac{11}{6}\pi
Combine -\pi and -\frac{5}{6}\pi to get -\frac{11}{6}\pi .
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