x + y + z = 0 అయితే, \(\rm\frac{1}{x^2 + y^2−z^2} + \frac{1}{y^2 + z^2−x^2} + \frac{1}{z^2 + x^2−y^2}\) యొక్క విలువ ?

1
\(\rm\frac{1}{x^2 + y^2 + z^2}\)
2
1
3
−1
4
0

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