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\left. \begin{array} { l } { x ^ { 3 } + x ^ { 2 } y + x y ^ { 2 } + y ^ { 3 } = 81 } \end{array} \right. |
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Answer» dy/dx x^3 + x^2y + xy^2 +y^3 =81 3x^2 + 2xy + y^2 = 0 |
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