1.

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

Answer»

`X^(2)+y^(2)+z^(2)=2xyz`
`x^(2)+y^(2)+z^(2)+2xyz=0`
`x^(2)+y^(2)+z^(2)+2xyz=1`
`xy+yz+zx=xyz`

Answer :C


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