$\lim_{x\to3}\left(\frac{cos\left(x-3\right)}{\left(x^2-3x\right)}\right)$
$49a^{10n}-\frac{b^{12}}{81}$
$-14z-7z$
$-17-\left(-8\right)$
$\int_{-1}^2x\left(2x-1\right)\left(x+3\right)dx$
$12\cdot15.5$
$\int\frac{sec+tg\:x}{\sqrt{sec\:x}}dx$
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