$\int\left(ex\:+\:4lnx\right)\:dx$
$\lim_{x\to1}\left(\sqrt{x^2+1}\right)$
$\int_{-\infty}^04e^x\sin\left(x\right)dx$
$9x^2+9x+1=0$
$\frac{28a^2b^3c}{7a^2b}$
$3ax^2-27y^3$
$\left(_{x\:-2}\right)\left(x+\:1\right)$
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