cos^(4)theta - sin^(4)theta का मान होगा...

`cos^(4)theta - sin^(4)theta` का मान होगा -

A

`1+2"sin"^(2)(theta)/(2)`

B

`2 cos^(2) theta - 1`

C

`1-2 sin^(2)theta//2`

D

`1+2 cos^(2)theta`.

लिखित उत्तर

Verified by Experts

The correct Answer is:

B

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