Michael J. answered 04/16/16
Tutor
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Effective High School STEM Tutor & CUNY Math Peer Leader
Using the identity tan2(t) = sin2(t) / cos2(t) to simplify the expression.
sin2(t) * [ sin2(t) / cos2(t)] * cos2(t) =
cos2(t) cancel each other out.
sin4(t)