If \( y=x \log \left(\frac{x}{a+b x}\right) \), then \( x^{3} \frac{d^{2} y}{d x^{2}}= \) \( \ma...
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0If \( y=x \log \left(\frac{x}{a+b x}\right) \), then \( x^{3} \frac{d^{2} y}{d x^{2}}= \)
\( \mathrm{P} \)
(1) \( x \frac{d y}{d x}-y \)
(2) \( \left(x \frac{d y}{d x}-y\right)^{2} \)
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(3) \( y \frac{d y}{d x}-x \)
(4) \( \left(y \frac{d y}{d x}-x\right)^{2} \)
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