$x^{2+20x}$

$si\:\frac{a}{b}+\frac{b}{a}=2\:calcula\:m=\frac{2a^2b+ab^2}{ab}$

$\int\:\frac{\left(2t+1\right)}{2\left(t^2+t\right)}dt$

$\frac{dy}{dx}=\frac{\left(x-1\right)}{y-1}$

$\left(m^2+x^3\right)^2$

$4\sqrt[3]{125}$

$\lim_{x\to-3}\left(\frac{x^2-9}{x^2-3x-19}\right)$