$\left(+72\right)\cdot\left(-9\right)$
$2x+x-x-2y$
$\frac{2x^3-23x^2+58x+35}{x+2}$
$4\cos x\sin^3x+4\sin x\cos^3x$
$\int\frac{x^2+1}{x^2-3x+2}dx$
$\left(2x+1+2xy\right)^2$
$\frac{2x-6a}{ax-2y}\cdot\frac{2x+4y}{bx-3bx}$
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