$y'=3x^2$
$\left(2x+5\right)x\left(2x-9\right)$
$\frac { x - 4 } { 2 x - 4 }$
$9x^2+60x+100=0$
$\int\:\:e^{-2y}dy$
$\lim_{x\to0}\left(e^{\frac{2}{x}}-\frac{2e^{\frac{2}{x}}}{x}\right)$
$\frac{91}{13}-9\cdot8+\frac{345}{5}$
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