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if cos x+cos y +cos alpha=0 and sin x+si...

if `cos x+cos y +cos alpha=0` and `sin x+siny+sin alpha=0`, then `cot((x+y)/(2))=`

A

`sinalpha`

B

`cosalpha`

C

`cotalpha`

D

`2sinalpha`

Text Solution

Verified by Experts

The correct Answer is:
C
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