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Let x , y , z be non - zero real numbers...

Let x , y , z be non - zero real numbers lying in the interval [-1,1] such that
`cos^-1 x + cos^-1 y + cos^-1 z = pi`
The value of `x^2 + y^2 + z^2` is equal to

A

1 + 2xyz

B

-1 + 2xyz

C

1 - 2xyz

D

none of these

Text Solution

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The correct Answer is:
C
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