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If 0 lt alpha, beta lt pi and cos alpha ...

If `0 lt alpha, beta lt pi and cos alpha +cos beta-cos(alpha+beta)=3//2` then `sin alpha+cos beta` is equal to

A

0

B

1

C

`(sqrt(3)+1)//2`

D

`sqrt(3)`

Text Solution

Verified by Experts

The correct Answer is:
c
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