Math, asked by prernabharti152002, 1 year ago

cos4x=1-8sin2x*cos2x

Answers

Answered by KnowMyPain

7

Cos 4x

=cos2(2x)

=1-2sin²(2x)

=1-2(2sinx . cosx)²

=1-2(4sin²x.cos²x)

=1-8sin²x.cos²x

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