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

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) `sin ((x+y)/(2))`

A

`sinalpha`

B

`cosalpha`

C

`cotalpha`

D

`sin((x+y)/2)=`

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