यदि ab + bc + ca = 0 है, तब \(\rm \frac{1}{a^2-b c}+\frac{1}{b^2-c a}+\frac{1}{c^2-a b}\) का मान ज्ञात कीजिए।

1
0
2
\(\rm \frac{1}{abc}\)
3
1
4
ab

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