$2xydx+\left(x^2+3y^2\right)dy=0$

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

$\frac{tan\:x\:\left(cos^2x-sin^2x\right)}{1+tan^2x}$

$4xy\left(\frac{4^{\frac{8}{4}}x^{\frac{14}{4}}}{4^{\frac{6}{4}}y^{\frac{7}{4}}}\right)$

$-\frac{2}{3}x\:+\:9\le\frac{5}{6}x-\frac{1}{2}$

$3n+\log\left(4\right)\cdot.3$

$2\sqrt{x}+\frac{y^2}{3}^2$