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If cos alpha + cos beta =0=sin alpha + s...

If `cos alpha + cos beta =0=sin alpha + sin beta`, then `cos 2 alpha + cos 2 beta=`

A

`-2 sin ( alpha + beta)`

B

`-2 cos ( alpha +beta)`

C

`2 sin ( alpha + beta)`

D

`2 cos ( alpha +beta)`

Text Solution

Verified by Experts

The correct Answer is:
B
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