hi my lecture notes were very vague this semester and nine o'clock in the morning isnt the easiest for a student that works till 1am each night.

i need some help with Residues, if anyone knows of a good website that has a good explanation and example of residue calculus it would help out.

the question im working on now is

us residue calculus and appropriate contours to evaluate real integrals

integral from 0 to infinity of 1/(x^4 +1) dx

thanks heaps in advance