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posted by eddie on Friday, February 4, 2011 at 2:37pm.
prove the identity sec^2x times cot x minus cot x = tan x
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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