$\lim_{x\to0}\left(\frac{13x-3^x}{x}\right)$
$\lim_{x\to0}\left(\frac{x^2+4}{sinx}\right)$
$\:\frac{dr}{dq}=275-q-0.3q^2$
$y^6-y^4-y^2+1$
$\left(2ab^2-6cd^3\right)\left(2ab^2+3cd^3\right)$
$\int\frac{x-3}{\left(x-1\right)\left(x^2+x-6\right)}dx$
$-\:5\:+\:6\:-\:\left(\:-\:6\:\right)\:+\:7\:-\:\left(\:-\:8\:\right)$
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