If cos^(-1)x +cos^(-1)y +cos^(-1)z =3pi ...

If `cos^(-1)x +cos^(-1)y +cos^(-1)z =3pi` then `x+y+z` is :

A

`-3`

B

0

C

3

D

`-1`

Verified by Experts

The correct Answer is:

A

`cos^(-1)x =cos^(-1)y = cos^(-1)z =pi rArr x=y=z=-1`

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