if cos theta(1) + cos theta(2) + cos the...

if `cos theta_(1) + cos theta_(2) + cos theta_(3)= sin theta_(1) + sin theta_(2) + sin theta_(3)= 0`, then the value of `cos (theta_(1) + theta_(2)) + cos (theta_(2) + theta_(3)) + cos (theta_(3) + theta_(1))` is

A

`-(3)/(2)`

B

`(1)/(2)`

C

0

D

1

Verified by Experts

The correct Answer is:

C

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