How to prove the identity? PLEASE HELP, 10 POINTS
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How to prove the identity? PLEASE HELP, 10 POINTS

[From: ] [author: ] [Date: 12-04-17] [Hit: ]
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How can I prove the identity sinx / 1-sinx - sinx / 1+sinx = 2tan^2x??
Please help me solve this problem, 10 points?

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(sinx/1-sinx)(1+sinx)-(sinx/1+sinx)(1-si…
(sinx+sin^2x-sinx+sin^2x)/(1+sinx)(1-s…
(2sin^2x/1-sin^2x)=(2sin^x/cos^2x)
(2sin^x/cos^2x)=(2sin^x/cos^2x)
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