If $y=\sqrt{e^{\sqrt{x}}}$, then $\frac{d y}{d x}=$

If $y=\sqrt{e^{\sqrt{x}}}$, then $\frac{d y}{d x}=$
  1. $\frac{e^{\sqrt{x}}}{4 \sqrt{x}}$
  2. $\frac{e^{\sqrt{x}}}{4 x}$
  3. $\frac{e^{\frac{\sqrt{x}}{2}}}{4 \sqrt{x}}$
  4. $\frac{\mathrm{e}^{\sqrt{\mathrm{x}}}}{2 \sqrt{\mathrm{x}}}$

Solution

$\begin{aligned} & 2 \log y=\sqrt{x} \log e \Rightarrow 2 \log y=\sqrt{x} \\ & \frac{2}{y} \frac{d y}{d x}=\frac{1}{2 \sqrt{x}} \Rightarrow \frac{d y}{d x}=y\left[\frac{1}{4 \sqrt{x}}\right]=\frac{\sqrt{e^{\sqrt{x}}}}{4 \sqrt{x}} \end{aligned}$ Taking $\log$ on both sides, $2 \log \mathrm{y}=\sqrt{\mathrm{x}} \log \mathrm{e} \Rightarrow 2 \log \mathrm{y}=\sqrt{\mathrm{x}}$ Differentiating both sides w.r.t. $x$, we get $\frac{2}{y} \frac{d y}{d x}=\frac{1}{2 \sqrt{x}} \Rightarrow \frac{d y}{d x}=y\left[\frac{1}{4 \sqrt{x}}\right]=\frac{\sqrt{e^{\sqrt{x}}}}{4 \sqrt{x}}$

Asked in: MHT CET 2021 (20 Sep Shift 2)

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