$\left(4x-1\right)\left(-2x+3\right)$
$-14x+28+6x=-44$
$31-20-\left(-15\right)$
$36x^6-49y^4$
$\int\frac{x^{4}+2x^{2}-x+9}{x^{3}+2x^{4}}dx$
$3.85-9.3$
$\lim_{x\to1.570796327}\left(\sec\left(x\right)\right)$
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