Originally Posted by

**elbarto** Hi,

Could somebody please help me with my assignment. I am up to the last question which involves multiple intergration. my problem with question** a** is that when i try to intergrate it with respect to x i get stuck after just a few lines. i have been useing integration by parts letting u=xy and dv=(1+x^4)^-0.5. could somebody please give me an idea on what is the best way to approach this (i dont think we are allowed to use intergrals for this problem). As for question **b**, i am yet to attempt the question but from inspection i dont entirely understand what dA is spose to represent. I assume we are spose to integrate over the contour x^2+Y^2=1 but why whould this be writen as x^2+Y^2 =< 1?

Thank you for any help you can give me, it will be greatly appreciated.

Regards Elbarto