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The value of [cos 2 (theta+ phi)+ 4 cos ...

The value of `[cos 2 (theta+ phi)+ 4 cos (theta + phi) sin theta sin phi+2 sin ^(2) phi]` is-

A

`cos 2 theta`

B

`sin 3 theta`

C

`sin 2 theta`

D

`cos 3 theta`

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The correct Answer is:
A
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