# Another complicated integral

• Jul 1st 2012, 03:38 PM
fractal5
Another complicated integral
I got a couple of integrals that I just can't seem to work out.

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

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

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

Thanks
• Jul 1st 2012, 04:05 PM
Plato
Re: Another complicated integral
Quote:

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

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

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

You can find help on the web.
• Jul 1st 2012, 09:48 PM
Prove It
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.
• Jul 4th 2012, 08:50 AM
fractal5
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.