$\lim_{x\to0}\left(\frac{ln\left(x+3\right)}{\sqrt[4]{x}}\right)$
$\left(+19\right).\left(-8\right)$
$x^2y+xy^2+x^2y^2$
$36x^2+9y^2-16z^2+72x-18y+64z-19=0$
$-x^2-5x+4$
$\frac{x-2}{x^2+x-2}=1$
$\int\:\frac{2x^3-25x-33}{\left(x+1\right)^2\left(x-5\right)}dx$
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