I'm not really sure how to go about this. This is what I've attempted:

\(\displaystyle x=t \Rightarrow \tfrac{\delta x}{\delta t} = 1\)

\(\displaystyle y= \tfrac{1}{t} \Rightarrow \tfrac{\delta y}{\delta t} = -\tfrac{1}{t^2}\)

\(\displaystyle \int_{C}f(X).dX = \int_{C} (x^2+xy).\partial x + (y-x^2y).\partial y = \int_{1}^{3} (t^2+1-\frac{1}{t^3}+\frac{1}{t}).\partial t \)

integrating that makes for a unpleasant mess: \(\displaystyle \frac{t^3}{3}+t+\frac{1}{2t^2}+ln(t)\) which is why I'm wondering if I'm doing this right.