$\frac{21x^3+14x^2}{7x}$
$\int\frac{3x^3+x}{\left(x^2-1\right)}dx$
$\lim_{x\to2}\left(\frac{3}{5}\right)^{\frac{-5}{\ln\left(3-x\right)}}$
$\left(3a\:+7b\right)^2$
$7+2x^3+2$
$-322+797$
$y'=2\left(1+x\right)\left(1+y^2\right)$
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