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September 18, 2014

September 18, 2014

Posted by **jhon** on Thursday, February 14, 2013 at 9:49am.

prove

- math -
**Steve**, Thursday, February 14, 2013 at 10:46amcosx/sinx + 2sinxcosx/cos2x

= (cosxcos2x + 2sin^2(x) cosx)/(sinxcos2x)

= cotxsec2x (cos2x + 2sin^2(x))

= cotx sec2x (1-2sin^2(x) + 2sin^2(x))

= cotx sec2x

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