Hello, PLease try to solve this question thanks.
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$\displaystyle \oint_C (y^2 dx + x^2 dy) = \iint_D \left( \frac{\partial x^2}{\partial x} - \frac{\partial y^2}{\partial y} \right) \ dA$ $\displaystyle 2 \iint_D x - y \ dA = 2\int_0^1 \int_0^{1-x} x -y \ dy \ dx $
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