how do i prove the trig identity?

Swinger jasonRoseHill (Male) from Mauritius, Rose Hill

Im trying to solve this integral, but my teacher told me to change it to ... Integrate Secx Tan 2x ... Convert the denominator into cot^2x: = secx*cot^2x

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Gender	Male
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Location	Mauritius, Plaines Wilhems, Rose Hill