Originally Posted by

**kittycat** question 2

Evaluate the integral

the integral of c of (-ydx+xdy)/(x^2+y^2)

if c is a positive smooth simple closed curve oriented counterclockwise such that

a) C DOES NOT ENCLOSE THE ORIGIN

b) C ENCLOSES THE ORIGIN.

um... for this question. I just don't get the picture and meaning of

a) C DOES NOT ENCLOSE THE ORIGIN

b) C ENCLOSES THE ORIGIN.

Could you please explain this to me maybe with a picture if possible ? Thank you very much.

Please don't show me how to calculate the second question because I have the solution for this question.