Let it be D Level R² an area on the edge of which ôD is parameterization Check that the curve C is closed and defines a level range D area. r(t) = Help: Select such a vector field F(x, y) = F₁(x, y)i + F₂(x, y)jthat and apply Green's theorem. Area (D) x(t) y(t) = = OF 2 Əx 1t 1+t³ 1t² 1+13 OF ,0 ≤ t <∞0. = 1

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