Ex: Evaluate a Trigonometric Expression Containing an Inverse Trig Function - Double Angle

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This video explains how to evaluate a trigonometric expression containing an inverse trig function. The expression also required the use of a double angle identity.
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Thanks.  The crappy PreCalc book that I'm  using doesn't have any examples of this sort of problem.  It was helpful to have a guide to work off of.

DrBeef