If the roots of the equation ax2 - 2bx + c = 0 are n and m, then the value of \(\rm \frac{b}{an^2+c}+\frac{b}{am^2+c}\) is:

1
\(\rm \frac{c}{a}\)
2
\(\rm \frac{b}{a}\)
3
\(\rm \frac{a}{c}\)
4
\(\rm \frac{b}{c}\)

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