Posted by Adc on Thursday, March 29, 2012 at 3:17pm.
LS = cosx = cosx/(1 - sinx/cosx))
= cosx - cosx/(cosx - sinx)/cosx) )
= cosx - cosx (cosx)/(cosx - sinx)
= cosx + cos^2 x /(sinx - cosx)
= (sinxcosx - cos^2 x + cos^2 x)/(sinx - cosx)
= sinxcosx/(sinx - cosx)
= RS
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