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If cosx+cosy+cosalpha=0 and sinx + siny ...

If `cosx+cosy+cosalpha=0` and `sinx + siny + sinalpha=0`, then `cot(x+y)/2=`

A

`sin alpha`

B

`cos alpha`

C

`cot alpha`

D

`2 sin alpha`

Text Solution

Verified by Experts

The correct Answer is:
C
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