$\frac{3x^3+1}{x^2}$

$\lim_{x\to13}\frac{\left(\sin\left(x-13\right)\right)}{x-13}$

$\lim_{x\to0}\left(\frac{x^2+5x}{\ln x}\right)$

$\lim_{x\to\infty}\left(\frac{\sqrt{x^2-3x}}{x}\right)$

$\left(7x+14\right)\left(7x-10\right)$

$\int\frac{3x^2}{7}dx$

$x\frac{dy}{dx}=4y$