Theoretical integral..closed smooth contour

[itsagoal89]

compute the integral of .....i cant find the integral symbol, but is the standard integral sign with a circle in the middle of it and a c to the bottom right of it.

F*dr where C is an arbitrary closed smooth contour that does not enclose the origin.

[itsagoal89]

where Vector Field F=(-y/(x^2+y^2),x/(x^2+y^2)