If x+y+z=0 then what is the value of ...

If `x+y+z=0` then what is the value of
`(1)/(x^(2)+y^(2)-z^(2)) +(1)/(y^(2)+z^(2)-x^(2)) +(1)/(z^(2)+x^(2)-y^(2))`?

A

`(1)/(x^(2) + y^(2) + z^(2))`

B

1

C

`-1`

D

0

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