You need to make a substitution, read this
Spherical coordinate system - Wikipedia, the free encyclopedia
You need to make a substitution, read this
Spherical coordinate system - Wikipedia, the free encyclopedia
I don't understand the question. That is "one dimensional" integral, in a single variable. How do you intend to change it to a three dimensional problem?
There is a method for integrating by: Squaring then writing it is the product of two integrals in x and y, then converting to polar coordinates. But that method won't work here because it depends upon the fact that [tex]e^{-x^2}[/math ] goes to 0 at both and .