$4-\frac{12}{4}$
$10a^2-8ab+15ab-12b^2$
$\lim_{x\to-2}\left(\frac{x^3+8}{x}\right)$
$\sqrt[3]{r^{-6}\left(r^{-3}\right)}$
$\int\frac{x^2-3x-1}{x^2+x-2}dx$
$-2\sec\left(x\right)+6=-10\sec\left(x\right)-10$
$\frac{x^{12}\left(x^4y\right)^{-3}}{6zy^{-3}}$
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