$\int_{-1}^1x^{-2}dx$
$-6x-12-2+9-6x$
$\int\frac{5x^3-12x-12}{x^3-4x}dx$
$\lim_{x\to\infty}\left(\frac{2x^3-2x^2+x-4}{x^3+2x^2-x+1}\right)$
$9x^2y-5yx^2$
$\int\left(z^2\right)dz$
$x^9+3\cdot x^6\cdot6x^3y\cdot4y+6y$
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