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Kenia Kenia
  • 30-03-2014
  • Mathematics
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cos^4x-sin^4x=cos2x

Verified Answer :

crisforp
crisforp crisforp
  • 30-03-2014

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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