$2xy+3x+4xy$
$0\:x\:-2\:+2$
$\lim_{x\to-1}\left(\frac{x^2}{x^4-1}\right)$
$\frac{6^7}{6^5}$
$\int_{-3}^3\left(\frac{1}{1+x^2}\right)dx$
$3m^3-6c^3$
$\lim_{x\to1}15x-7$
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