# Math Help - error function!!

1. ## error function!!

Hi
I have a problem I hope you can help me solve. I am working with the error function. I have looked at
some papers involving all the combinations of this function with other functions and their integrations, but this particular model is not listed in there:

int{erf(a*sqrt((x-a)^2+b^2))))/((x-a)^2+b^2)} with respect to x

I would really appreciate it if you let me know which formula you think I should use to derive this integral.
Many thanks

2. ## Re: error function!!

Hey kereshmeh.

Try using a substitution formula for u = (x-a)^2 and see where that takes you.

3. ## Re: error function!!

Please recheck if the question has been written correctly.

4. ## Re: error function!!

It's correct
what is the problem

5. ## Re: error function!!

Note the number of pairs of parenthesis in the numerator