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posted by Jerry Tuesday, November 13, 2012 at 9:46am.
Prove or disprove the following identity sin^4theta - cos^4theta = sin^2theta-cose^2theta
LS = sin^4 Ø - cos^4 Ø = (sin^2 Ø + cos^2 Ø)(sin^2 Ø - cos^2 Ø) = (1)(sin^2 Ø - cos^2 Ø) = RS
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