1. The problem statement, all variables and given/known data F=<xy, x-y> and C is the triangle joining (1,0), (0,1) and (-1,0) in the clockwise direction. 2. Relevant equations How do I have the second part of this curve? 3. The attempt at a solution Apparently, there should only be a sum of two integrals. So I got that curve one could be [tex]C_1: x=t, y=0, -1≤ t ≤ 1[/tex] But I have no idea how to find [tex]C_2[/tex]. There's no other way, that I see, that you can take such that you keep x constant and let y vary.