$-8x^2+x-13+6x^2-3x-2$
$\lim_{x\to k}\left(\frac{x^2-4}{x^2-3x+2}\right)$
$\frac { ( 3 x + 2 ) ^ { 2 } } { 4 }$
$1x^3+7^2-x+28$
$\left(-a^2\right)^{-3}$
$\int e^{2x}\sin\left(3x\right)\:dx$
$3xy^2-3xy^2+11y^2x$
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