$xydx+\left(y-1\right)dy=0$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{140-7\pi}{cos\left(2\pi-x\right)}\right)$

$y'\:=\:\frac{\left(6t^2\right)}{y}$

$\frac{12\left(x-2\right)^2}{6\left(x+2\right)\left(x+5\right)}$

$\left(2a+3y\right)^2$

$134,98\:=\:89,348$

$\frac{dy}{dx}-\frac{y}{x}=2\:+\sqrt{x}$