$\left|-10\right|+\left|-8\right|+\left|-11\right|$
$-5+\left(-2+5\right)-\left(2+7-3\right)+18$
$tan\:u\:=\frac{sin\:u}{cos\:u}$
$12x^2-x-20$
$\frac{dy}{dx}=\frac{y+2}{x-1}$
$\frac{144x^4-900y^8}{12x^2-30y^4}$
$\int\frac{\left(4e^{6x}-3e^{3x}+e^{-x}\right)}{5e^{2x}}dx$
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