$30+4-23+5-67+21$
$6y^2x^3dx+4x^3y^2dy=0$
$\frac{3x-1}{2}<7$
$\frac{dy}{dx}=2y+x^5+5$
$\lim_{x\to2}\left(\frac{x^2\:-\:4}{e^{x\:-\:2}\:-\:1}\right)$
$\cos^2+\sec^2$
$\int\frac{\sen5x}{\sqrt{5-\cos5x}}dx$
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