Answer
$-10xe^{-5x^2}$
Work Step by Step
Given $$y= e^{-5x^2}.$$ We will apply the chain rule for $y=e^u$, where $u=-5x^2$: $$\begin{aligned}
\frac{dy}{dx}&=u'e^u\\
\frac{dy}{dx}&=(-5x^2)'e^{-5x^2}\\
&=-10xe^{-5x^2}.
\end{aligned}$$
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