$\frac{dy}{dx}=\frac{\left(1+y^2\right)}{\left(1+x^2\right)xy}$

$3\left(-0.5\right)^2\frac{2}{3}+2\:\left(-0.5\right)$

$12m+5n+7m^2+10n$

$2x^2+22x+60$

$6.4-7-2.9r$

$\int\frac{\left(x-1\right)}{\left(x+1\right)^2\left(x+3\right)}dx$

$\lim_{n\to\infty}\left(n-\sqrt{\left(n+a\right)\left(n+b\right)}\right)$