Post Closed as "too localized" by Andrey Rekalo, Tim Perutz, Steven Gubkin, Alex Bartel, Francesco Polizzi
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# How to derivate $e^{f(x)}$ where $f(x) = -3x$

I'm looking to integrate this:

$\int e^{-3x} \mathrm{d}x.$

Is there any formula for $e^{f(x)}$ ? Is there a website/reference with the most common integral formulas?

Thanks for you help