Posted by eddie on Friday, February 4, 2011 at 2:37pm.
LS = (1/cos^2 x)(cosx/sinx) - cosx/sinx
= 1/(cosxsinx) - cosx/sinx
= (1 - cos^2x)/(sinxcosx)
= sin^2x/(sinxcox)
= sinx/cosx
= tanx
= RS
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