Find the circulation and flux of the fields: $\vec{F}_1 = 2x\vec{i} - 3y\vec{j}$; $\vec{F}_2 = 2x\vec{i} + (x - y)\vec{j}$ around and across the curve $\vec{r}(t) = (a\cos t)\vec{i} + b\sin t\vec{j}$; $0 \le t \le 2\pi$.
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