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If alpha=cos alpha+i sin alpha, b=cos be...

If `alpha=cos alpha+i sin alpha, b=cos beta+isin beta,c=cos gamma+i sin gamma and b/c+c/a+a/b=1,` then `cos(beta-gamma)+cos(gamma-alpha)+cos(alpha-beta)=`

A

`3//2`

B

`-3//2`

C

0

D

1

Text Solution

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The correct Answer is:
D
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