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Let alphaandbeta be such that piltalp...

Let `alphaandbeta` be such that `piltalpha-betalt3pi`If `sinalpha+sinbeta=-21//65andcosalpha+cosbeta=-27//65` , then value of `cos[(alpha-beta)//2]` is

A

`-(3)/(sqrt(130))`

B

`(3)/(sqrt(130))`

C

`(6)/(65)`

D

`-(6)/(65)`

Text Solution

Verified by Experts

The correct Answer is:
A
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