$x^3+x-2$

$\left(\frac{250k}{n}\right)^3$

$\cos\left(x-y\right)\cos\left(y\right)-\sin\left(x-y\right)\sin\left(x\right)$

$x^3\frac{dy}{dx}=y^2\left(x-4\right)$

$\lim_{x\to0}\left(\frac{x+\sin\left(x\right)}{2x^2-2x}\right)$

$\int\frac{x^4+2x}{x^2+1}dx$

$3xy^2z-4xz^2$