The value of (x^2-(y-z)^2)/((x+z)^2-y...

The value of `(x^2-(y-z)^2)/((x+z)^2-y^2)+(y^2-(x-z)^2)/((x+y)^2-z^2)+(z^2-(x-y)^2)/((y+z)^2-x^2)` is `-1` (b) 0 (c) 1 (d) None of these

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