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If a=cis alpha , b= cis beta, c= cis gam...

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

A

0

B

1

C

-1

D

2

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B
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HIMALAYA PUBLICATION-COMPLEX NUMBERS-QUESTION BANK
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