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2 sin ^(2) beta + 4 cos (alpha + beta) s...

`2 sin ^(2) beta + 4 cos (alpha + beta) sin alpha sin beta + cos 2 (alpha + beta )=`

A

` sin 2 alpha `

B

`cos 2 beta `

C

`cos 2 alpha `

D

`sin 2 beta `

Text Solution

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The correct Answer is:
C
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