$\left(\frac{1}{x}\right)\left(\frac{6}{x}\right)$
$-18.268+-9257$
$\lim_{x\to0}\left(3x^2\:-\:4x\:+5\right)$
$xy'=4x$
$\left(6a^2-5ab-4b^2\right)+\left(13a^2+2b^2-4ab\right)$
$3x^5-2x^4+2x^2+4-1$
$12a^3b^2+30a^2b^3$
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