$\lim_{x\to0}\left(\frac{\sqrt{x}}{e^x}\right)$
$\int\left(9\:sen3x-4cos2x\right)dx$
$\frac{13x}{3}\left(\frac{3x}{5}+\frac{5y}{3}\right)-\frac{3y}{13}\left(13+\frac{13x}{3}\right)$
$3m\:+\:42m\:\:+\:49\:$
$\frac{3x^3+3x^2+4x+21}{x+2}$
$\lim_{x\to\infty}\left(x+\left(x^2-5x\right)\right)$
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