Question

y(y^3-1)-y^2(y^2-1)-y^3(y-1)​

Answer 1

$y(y 3 - 1) - y2(y2 - 1) - y3(y - 1)$

$= y4 - y - y4 + 1 - y4 + 1$

$= 2 - y4 - y$

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