cos^4 A-sin^4 A is equal to...

`cos^4 A-sin^4 A` is equal to

A

`2cos^2A+1`

B

`2cos^2A-1`

C

`2sin^2A-1`

D

`2sin^2A+1`

लिखित उत्तर

Verified by Experts

The correct Answer is:

B

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