# Use Stokes' theorem to evaluate the line integral oint_C F*dr where A = -yi + xj and C is the boundary of the ellipse x^2/a^2+y^2/b^2=1, z = 0.

Use Stokes' theorem to evaluate the line integral ${\oint }_{C}F\cdot dr$ where A = -yi + xj and C is the boundary of the ellipse $\frac{{x}^{2}}{{a}^{2}}+\frac{{y}^{2}}{{b}^{2}}=1,z=0$.
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