General simplification
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$$- 2 x^{3} + 2 x^{2} y^{2} + y^{3}$$
/ / _______________ \\ / / _______________ \\ / / _______________ \\
| | / _____ / ___\ || | | / _____ / ___\ || | | / _____ ||
| |1 / 31 \/ 105 | 1 I*\/ 3 | 1 || | |1 / 31 \/ 105 | 1 I*\/ 3 | 1 || | |1 / 31 \/ 105 1 ||
|x - y*|- + 3 / --- + ------- *|- - - -------| + --------------------------------------||*|x - y*|- + 3 / --- + ------- *|- - + -------| + --------------------------------------||*|x - y*|- + 3 / --- + ------- + ----------------------||
| |3 \/ 108 36 \ 2 2 / _______________|| | |3 \/ 108 36 \ 2 2 / _______________|| | |3 \/ 108 36 _______________||
| | / ___\ / _____ || | | / ___\ / _____ || | | / _____ ||
| | | 1 I*\/ 3 | / 31 \/ 105 || | | | 1 I*\/ 3 | / 31 \/ 105 || | | / 31 \/ 105 ||
| | 9*|- - - -------|*3 / --- + ------- || | | 9*|- - + -------|*3 / --- + ------- || | | 9*3 / --- + ------- ||
\ \ \ 2 2 / \/ 108 36 // \ \ \ 2 2 / \/ 108 36 // \ \ \/ 108 36 //
$$\left(x - y \left(\frac{1}{3} + \left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{\frac{\sqrt{105}}{36} + \frac{31}{108}} + \frac{1}{9 \left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{\frac{\sqrt{105}}{36} + \frac{31}{108}}}\right)\right) \left(x - y \left(\frac{1}{3} + \frac{1}{9 \left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{\frac{\sqrt{105}}{36} + \frac{31}{108}}} + \left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{\frac{\sqrt{105}}{36} + \frac{31}{108}}\right)\right) \left(x - y \left(\frac{1}{9 \sqrt[3]{\frac{\sqrt{105}}{36} + \frac{31}{108}}} + \frac{1}{3} + \sqrt[3]{\frac{\sqrt{105}}{36} + \frac{31}{108}}\right)\right)$$
((x - y*(1/3 + (31/108 + sqrt(105)/36)^(1/3)*(-1/2 - i*sqrt(3)/2) + 1/(9*(-1/2 - i*sqrt(3)/2)*(31/108 + sqrt(105)/36)^(1/3))))*(x - y*(1/3 + (31/108 + sqrt(105)/36)^(1/3)*(-1/2 + i*sqrt(3)/2) + 1/(9*(-1/2 + i*sqrt(3)/2)*(31/108 + sqrt(105)/36)^(1/3)))))*(x - y*(1/3 + (31/108 + sqrt(105)/36)^(1/3) + 1/(9*(31/108 + sqrt(105)/36)^(1/3))))
y^3 - 2.0*x^3 + 2.0*x^2*y^2
y^3 - 2.0*x^3 + 2.0*x^2*y^2
$$- 2 x^{3} + 2 x^{2} y^{2} + y^{3}$$
$$- 2 x^{3} + 2 x^{2} y^{2} + y^{3}$$
Combining rational expressions
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3 2 / 2\
- 2*x + y *\y + 2*x /
$$- 2 x^{3} + y^{2} \left(2 x^{2} + y\right)$$
$$- 2 x^{3} + 2 x^{2} y^{2} + y^{3}$$
$$- 2 x^{3} + 2 x^{2} y^{2} + y^{3}$$
Assemble expression
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$$- 2 x^{3} + 2 x^{2} y^{2} + y^{3}$$
Rational denominator
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$$- 2 x^{3} + 2 x^{2} y^{2} + y^{3}$$