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# Integrating ex and its friends

You're going to like this part. Since , we know immediately that:

In other words, if ex is its own mother, then it's its own child, too.

Now, we can find lots of other integrals using substitution. For instance,

(You know, u=3x, du=3dx, etc. Usual drill.)

More generally, it's worth remembering that:

We could also use substitution or eyeball to see that

Joel Hass
1999-05-26