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Maybe I don't see the wood because of all the trees, but:

You have a second derivative [itex] \frac{\mathrm{d}^2}{\mathrm{d}x^2} e^{-ax} \cdot u(ax) [/itex]

Now you make the variable transformation [itex] w=ax [/itex]

How to express

[itex] \frac{\mathrm{d}^2}{\mathrm{d}w^2} [/itex]

Thanks

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# Variable transformation in a derivative

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