Another complicated integral

I got a couple of integrals that I just can't seem to work out.

$\displaystyle \int\frac{ln t}{e^4^t}dt$

$\displaystyle \int\frac{ln t}{te^4^t}dt$

I've tried integration by parts but it keeps going round and round. Can anyone help me here?

Thanks

Re: Another complicated integral

Quote:

Originally Posted by

**fractal5** I got a couple of integrals that I just can't seem to work out.

$\displaystyle \int\frac{ln t}{e^4^t}dt$

$\displaystyle \int\frac{ln t}{te^4^t}dt$

You can find help on the web.

Re: Another complicated integral

Neither have closed form solutions, so unless you know about Exponential Integrals, Hypergeometric functions and the Gamma Function, I would advise looking for a series solution to these.

Re: Another complicated integral

Yeah that doesn't make sense. We wouldn't be asked to solve integrals of this form. I must've made some mistake the in the steps to obtain the integrals. But anyway, thanks for the help, and thanks for that link. Will be handy in the future.