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যদি y=f(x) এবং

x = \frac{1}{z}

\frac{d^{2} f}{d x^{2}} = z^{4} \frac{d^{2} y}{d z^{2}} + 2 z^{3} \frac{d y}{d z}

z^{4} \frac{d^{2} y}{d z^{2}} + 2 z^{3} \frac{d y}{d z}

ANS : 1

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