यदि cos ^(-1) x + cos ^(-1) y + cos ^(-1...

यदि `cos ^(-1) x + cos ^(-1) y + cos ^(-1) z = pi` तो `x ^(2) + y ^(2) + z ^(2) + 2 xyz` बराबर है -

A

1

B

`-1`

C

`pi/2`

D

`0`

Verified by Experts

The correct Answer is:

A

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