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sin alpha + sin beta = 1/4 and cos alpha...

`sin alpha + sin beta = 1/4 and cos alpha + cos beta = 1/3`
The value of `cos ( alpha + beta)` is

A

`12/25`

B

`7/25`

C

`12/13`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
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