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cos^(4)theta-sin^(4)theta is equal to...

`cos^(4)theta-sin^(4)theta` is equal to

A

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

B

`2cos^2theta-1`

C

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

D

`1+2cos^2theta`

Text Solution

Verified by Experts

The correct Answer is:
B
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