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

$y'\cdot cosx+y\cdot senx=0$

$\int\frac{\cot\left(^1\right)\sqrt{z}}{\sqrt{z}}dz$

$\lim_{x\to\infty}\left(\frac{x^2\sin\left(\frac{1}{x}\right)}{\sin\left(x\right)}\right)$

$\frac{4a^4b^{-3}}{ba^{-3}}$

$\frac{x-y}{\sqrt{x}-\sqrt{y}}$

$\frac{2x-4}{3}=10$