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cos 2 (theta+ phi) +4 cos (theta + phi )...

`cos 2 (theta+ phi) +4 cos (theta + phi ) sin theta sin phi + 2 sin ^(2) phi=`

A

`cos 2 theta `

B

`cos 3 theta`

C

`sin 2 theta `

D

`sin 3 theta`

Text Solution

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The correct Answer is:
A
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