$\lim_{x\to0}\left(\frac{1-senx}{cos^2x}\right)$
$\int\:\int\:\frac{2x^4-6x^3+7x^2-3x+2}{x-2}dx$
$\left(a+6\right)^7$
$m\left(x+5\right)+n\left(x+5\right)-4x-20$
$\sqrt{32}-\sqrt{50}$
$\frac{d}{dx}\frac{x^2+2x+3}{2x^2-1}$
$\frac{6}{3}\cdot\frac{5}{2}$
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