Posted by Lynn on Thursday, July 19, 2012 at 12:45pm.
You must mean
(1-cosx)/sinx = sinx/(1+cosx)
LS = (1-cosx)/sinx * (1+cosx)/(1+cosx)
= 1 - cos^2 x)/(sinx(1+cosx) )
= sin^2 x/(sinx(1+cosx) )
= sinx/(1+cosx)
= RS
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