$2m-m^3+3m^2$
$\left(a^3\right)\left(6a^4\right)$
$\left(\frac{1}{2}x+3a\right)^3$
$5\left(a+4\right)$
$\:4000=50x+250$
$\lim_{x\to0}\left(\frac{sen\:2x}{x}\right)^{tg\:3x}$
$x-8=15$
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