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If a=cisalpha,b=cisbeta,c=cisgamma, and ...

If `a=cisalpha,b=cisbeta,c=cisgamma`, and `a/b+b/c+c/a-1=0` then
`cos(alpha-beta)+cos(beta-gamma)``+ cos(gamma-alpha)`=

A

0

B

1

C

`-1`

D

2

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