$trinomio$

$x\ln\left(x\right)\frac{dy}{dx}+y=3x^3$

$\frac{d}{dx}\left(3y-4x-6=0\right)$

$5n^2+2n^2$

$\:\int_{-1}^2\:\:\frac{x}{x^2-x-6}dx$

$7\left(\frac{-1}{7}\right)\left(-2\right)^4-\frac{1}{7}\left(\frac{-1}{7}\right)\left(-2\right)\left(49\right)+\left(-2\right)^2$

$ln\left(x-15\right)-ln\left(x\right)=2$