1. The problem statement, all variables and given/known data Let C be the (positively oriented) boundary of the first quadrant of the unit disk. Use the definition of the line integral to find ∫(xy)dx+(x+y)dy 2. Relevant equations x=rcos(x) y=rsin(x) dx=-sin(x) dy=cos(y) 0≤ t ≤ ∏/2 3. The attempt at a solution ∫-cos(t)sin^2(t)+cos^2(t)+sin(t)cos(t) dt from 0 to ∏/2 Then I finished out the integral and was left with ∏/4-5/6 which is incorrect. Could it possibly have to do with the r or my limits of integration?