Math, asked by spandansigdel3, 5 months ago

prove that cos^4A - sin^4A = cos2A

Answers

Answered by Anonymous

6

Answer:

Step-by-step explanation:

cos^4A-sin^A=

(cos^2A-sin^2A)(cos^2A+sin^2A)=

(cos^2A)(1)=cos^A

as cos^A-sin^2A= cos^2A

and cos^2A+sin^2A=1

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