$\frac{d^2}{dx^2}\left(x\:^2y\:^2-2x=3\right)$

$5d^2-96d+19$

$\frac{dy}{dx}=x^4+\left(\frac{y}{x}\right)$

$\int\cos\left(\frac{x}{5}\right)cos\left(\frac{x}{3}\right)dx$

$\left(\cos\left(x\right)\cos\left(y\right)-\cot\left(x\right)\right)dx-\left(\sin\left(x\right)\sin\left(y\right)\right)dy=0$

$3x^2-24x+36=0$

$x^2+3x-12=0$