$xsinydx\:+\:\left(x^2+1\right)cosydy\:=\:0;\:\:y\left(1\right)\:=\:\frac{n}{2}$

$\lim_{p\to0}\left(\frac{p}{1-\left(1-p\right)\cdot e^{2p}}\right)$

$x^2+13x+30=0$

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

$2x^2-4xy-6y^2$

$xy^2dx+xdy=0$

$\lim_{x\to0}\left(\frac{\ln\left(2x+1\right)\sin\left(2x\right)}{x^2}\right)$