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

If `cos^(-1)x+cos^(-1)y+cos^(-1)z=pi`, then

A

`x^(2) + y^(2) + z^(2) + 2xyz = 1`

B

`2(sin^(-1) x + sin^(-1)y + sin^(-1)z) = cos^(-1) x + cos^(-1) y + cos^(-1) z `

C

` xy + yz + zx = x + y + z - 1`

D

`( x + 1/x) + ( y + 1/y) + ( z+ 1/z) ge 6`

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The correct Answer is:

A, B

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