(x-y-z)^2-(x^2+y^2+z^2)=2(yz-zx-xy)...

`(x-y-z)^2-(x^2+y^2+z^2)=2(yz-zx-xy)`

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`L.H.S. = (x-y-z)^2-(x^2+y^2+z^2)`
`=(x^2+y^2+z^2-2xy-2zx+2yz) - (x^2+y^2+z^2)`
`=2yz-2zx-2xy`
`=2(yz-zx-xy) = R.H.S.`

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