- #1

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**What's the variable of integration?**

I keep seeing posts like this:

Help me do this integral

[tex]

\int xe^{-ax}

[/tex]

Shouldn't we all ask, right off the bat, "What's the variable of integration?"

Probably what was meant was:

[tex] \int xe^{-ax}\, dx \,. [/tex]

But maybe the problem actually was:

[tex] \int xe^{-ax}\, da \,. [/tex]

Does this bother any of you?