$\frac{600}{x^2+300}<500$

$\lim_{x\to\infty}\left(\frac{x^k}{2^x}\right)$

$\left(21a^3+5b^3+2c^4\right)^2$

$\left(-48\right)\left(-6\right)$

$\int\frac{x^2+x+1}{\left(2x+3\right)\left(4-x\right)\left(1-2x\right)}dx$

$12x^3y^4-4x^2y^2\:-48x^2yz\:+\:8x^5yz\:$

$\frac{x+x}{x}$