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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

`sinalpha`

B

`cosalpha`

C

`cotalpha`

D

`2sinalpha`

Text Solution

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The correct Answer is:
C
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