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If x=costheta+isintheta, y=cosphi+isinph...

If `x=costheta+isintheta`, `y=cosphi+isinphi`, `z=cosPsi+isinPsi` and `(y)/(z)+(z)/(x)+(x)/(y)=1`, then : `cos(phi-Psi)+cos(Psi-theta)+cos(theta-phi)` is :

A

`(3)/(2)`

B

`(-3)/(2)`

C

`0`

D

`1`

Text Solution

Verified by Experts

The correct Answer is:
D
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