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Show that 2"sin"^(2)beta+4 cos(alpha+...

Show that
`2"sin"^(2)beta+4 cos(alpha+beta)"sin" alpha sin beta+cos2(alpha+beta)=cos 2alpha`.

A

`sin2alpha`

B

`cos2beta`

C

`cos2alpha`

D

`sin2beta`

Text Solution

Verified by Experts

The correct Answer is:
C
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