Math, asked by deepak7955, 2 months ago

prove that cos4x-sin4x=2cos2.x-1

Answers

Answered by helpingsrujan

1

Answer:

PLS MARK ME BRAINLIEST

Step-by-step explanation:

LHS=sin4x+cos4x

=(sin2x)2+cos4x

=(1−cos2x)2+cos4x

=1+cos4x−2cos2x+cos4x

=1−2cos2x+2cos4x

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