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

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If `cosx+cosy+cosalpha=0` and `sinx + siny + sinalpha=0`, then `cot((x+y)/2)=`
A. `sinalpha`
B. `cosalpha`
C. `cotalpha`
D. `2sinalpha`
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1 Answer

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Correct Answer - C
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