Posted by Hannah on Friday, March 5, 2010 at 12:55pm.
cos(pi/2-x) = sinx
(e.g. cos 70 = sin 20)
[cos^2 (pi/2-x)]/cosx = sin^2 x/cosx
= (sinx/cosx)sinx
= tanxsinx
Don't know what you mean by "match with this"
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