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posted by Rosilyn on Saturday, October 8, 2011 at 2:21pm.
Prove that the equation Is an identity. Sec^4x - Tan^4x = Sec^2x + Tan^2x
LS = (sec^2 x - tan^2x)(sec^2x + tan^2x) = (1 + tan^2x - tan^2x)(sec^2x + tan^2x) = 1(sec^2x + tan^2x) = RS
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