Q .     If `cosalpha + isinalpha, b = cosbeta+ isinbeta`,

`c = cos gamma+ i sin gamma` and `b/c + c/a + a/b = 1`, then

`cos(beta- gamma) + cos(gamma-alpha)+ cos(alpha - beta)` is equal to

VIT 2014
A

`3/2`

B

`-3/2`

C

`0`

D

`1`

HINT

` b/c = cos(beta - gamma) + i sin (beta - gamma) ` similarly
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