If $x=e^{(y+e)^{(y+e)}(y+\ldots \ldots \infty)}$, then $\frac{d y}{d x}=$
If $x=e^{(y+e)^{(y+e)}(y+\ldots \ldots \infty)}$, then $\frac{d y}{d x}=$
- $\frac{1-x}{x}$
- $\frac{1+x}{x}$
- $\frac{1}{x}$
- $\frac{x}{1+x}$
Solution
Here $x=e^{y+x}$
Differentiating w.r.t. $\mathrm{x}$
$\begin{array}{l}
1=e^{y+x}\left(\frac{d y}{d x}+1\right) \Rightarrow 1=e^{y+x} \frac{d y}{d x}+e^{y+x} \\
\therefore 1=x \cdot \frac{d y}{d x}+x \\
\frac{d y}{d x}=\frac{1-x}{x}
\end{array}$
Asked in: MHT CET 2020 (20 Oct Shift 1)
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