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Simplifying a Trigonometric Expression

Please give detailed explanation. Please see attached file for full problem description.

Simplify sin2x( 1 + cot2 x)

A). sin2x - tan2x
B). +1
C). -1
D). cos2x
E). None of the above


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sin2x( 1 + cot2 x)

Follow along each of the steps below. In each step, I replace one term with an equivalent term or ...