31-03-2014
Mathematics

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cos^4x-sin^4x=cos2x

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crisforp crisforp

31-03-2014

a^2 - b^2 = (a - b)( a +b);
cos^4x-sin^4x =( cos^2x + sin^2x )( cos^2x - sin^2x) = 1* cos2x = co2x.

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