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If xy = a, xz = b, yz = c and abc ne 0, ...

If` xy = a, xz = b, yz = c` and `abc ne 0`, find the value of `x^2 + y^2 + z^2` in terms of `a, b, c`.

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The correct Answer is:
`(ab)/c+(bc)/a+(ac)/b`
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