Hi,

1.) Let R be the region in the xy plane that is outside the circle x^2+y^2=1 but inside the circle x^2+y^2=2 . Evaluate the double integral

double integration over R {1/x^2+y^2}dA

2.) Evaluate the integrals

double integrals

integral 0 to infinite integral 0 to infinite {dydx/(1+x^2+y^2)^3/2)

sorry if it is difficult to understand in written pattern.

I will appreciate if any can help me and thanks again