Question

x(x+y)cube -3xsquare y (x+y)​

Answer 1

$x(x + y) {}^{3} - 3 {x}^{2} y(x + y)$

${x}^{4} + {y}^{4} - 3 {x}^{3} y + 3 {x}^{2} {y}^{2}$

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