$17\:+\:-3\:+\:12\:+\:2$

$45x^3y^4z^2-9x^2y^6z$

$\lim_{x\to\infty}\left(2xsin\left(\frac{3.14}{2}\right)\right)$

$12\sqrt{64m^6n^{18}}$

$\lim_{x\to2}\left(\frac{3x^3+2x^2}{x+2}\right)$

$\frac{\left(-5x^2-9x+2\right)}{x^2-2}$

$\lim_{x\to\infty}\left(x\sqrt{2+\frac{1}{x}}-\left(\sqrt{2}x-3\right)\right)$