$\frac{d^2}{dx^2}\left(2x-1+\left(\frac{3}{x-3}\right)\right)$
$5x\left(x+1\right)-2x\left(x+1\right)$
$\frac{d^2x}{d^2y}\left(x^3+y^3-3xy=3\right)$
$4xy+3y$
$\frac{4x^3-2x^2}{2x}$
$\int\frac{2x-1}{\left(x+1\right)^2\left(x-2\right)}dx$
$-18-\left(-21\right)$
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