$\int\frac{3x^3}{\sqrt{49+x^2}}dx$

$4\sqrt{4^2}-4\cdot3\cdot5$

$\left(5-\sqrt{7}\right)\left(5+\sqrt{7}\right)$

$x^4+12x^2y^5+36y^{10}$

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

$\frac{dy}{dx}\left(8+x^6\right)=\frac{x^5}{y}$

$\frac{dy}{dx}\left(2x^3y^2-10x^2y=8\right)$