$56\cdot20$
$2xyx'=\left(x^2-1\right)$
$\left(9m^2-3n\right)^2$
$10x-15$
$\lim_{x\to0}\left(8sin\left(9x\right)ln\left(9x\right)\right)$
$15x-2x-8$
$5x^2+11x-12$
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