$\frac{dy}{dx}=\frac{x^2+y^2}{x^2}$

$\frac{dy}{dx}=50-2y$

$y''+10y'+50y=0$

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

$\left(-99\right)-\left(+23\right)+\left(-42\right)-\left(-38\right)$

$\left(\sqrt{\sqrt{\sqrt{\sqrt{2}}}}\right)^{48}$

$\frac{\left(b^4-8b^2+15\right)}{\left(b^4-5b^2+6\right)}$