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प्रश्न
उत्तर
\[x = e^\frac{x} {y} \]
\[\text{ Taking logarithm on both sides, we get }\]
\[\log x = \frac{x}{y}\]
\[ \Rightarrow y\log x = x\]
\[ \Rightarrow \log x\frac{dy}{dx} + \frac{y}{x} = 1\]
\[ \Rightarrow \log x\frac{dy}{dx} = 1 - \frac{y}{x}\]
\[ \Rightarrow \log x\frac{dy}{dx} = \frac{x - y}{x}\]
\[ \Rightarrow x\log x\frac{dy}{dx} = x - y\]
\[ \Rightarrow \frac{dy}{dx} = \frac{x - y}{x\log x}\]
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