Answers

2014-01-08T16:30:24+08:00
(1 + 1/cosx)(1-cosx) = tanxsinx
1 - cosx + 1/cosx -1 = (sinx/cosx)(sinx)
(-cos^(2) x + 1)/cosx = (sin^(2) x)/cosx
 \frac{ sin^{2} x }{cosx} =   \frac{ sin^{2} x }{cosx}
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