$x2\:+\:8x+\:81=0$
$x^2-x-28$
$\int_{\frac{\pi}{2}}^{\pi}\left(\cos\left(nx\right)\right)dx$
$3x^2+2y^2-1\left(3x^2\right)$
$\frac{3x^3-x+1}{x+3}$
$\frac{50}{x+5}=\frac{x}{10}+4.5$
$\int\frac{2\cos x}{senx+5}dx$
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