$-8\:+\:1\:-\:7\:+\:2$
$\left(x^2+2xy+y^2\right)\left(x-y\right)$
$3\sin^2x-7\sin x-6$
$\lim_{x\to-2}\left(\frac{x^2+7x-10}{x+2}\right)$
$\frac{8\left(m^{-2}\right)}{4\left(n^{-1}\right)}$
$\frac{d}{dx}\left(3^{2x^2-5x}\right)$
$-5y+4y+y$
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