Keniaid
Keniaid
Mathematics
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cos^4x-sin^4x=cos2x
Sagot :
Crisforpid
Crisforpid
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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