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OpenStudy (anonymous):
sin^4x - cos^4x = 2sin^2x-1 prove : what I got so far is (sinx-cosx )(sinx+cosx)(sin^2x+cos^2x) sin^2x -cos^2x then im pretty much stuck
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OpenStudy (anonymous):
sin^2x - (1-sin^2x) sin^2x +sin^2x - 1 ohh..... i got it now lol...
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