Math, asked by ammulukasturi, 1 year ago

Cos ^4 A - sin ^4 A is equal to

Answers

Answered by vyshnavi74

0

Answer:

f(x)=cos4x−sin4x=(cos2x−sin2x)(cos2x+sin2x)

Reminder of trig identities:

cos2x−sin2x=cos2x

(sin2x+cos2x)=1

Therefor,

f(x)=cos2x

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