यदि y = f(x), \(\rm p=\frac{dy}{dx}\) और \(\rm q=\frac{d^2y}{dx^2}\) है, तो \(\rm \frac{d^2x}{dy^2}\) किसके बराबर होगा?

1
\(\rm -\frac{q}{p^2}\)
2
\(\rm -\frac{q}{p^3}\)
3
\(\rm \frac{1}{q}\)
4
\(\rm \frac{q}{p^2}\)

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