$\lim_{x\to\infty}\:\left(\frac{x^6+3x^2}{x^3+5x^5}\right)$

$\left(4-z^2\right)\left(z^3\:-3z+1\right)$

$\left(\sqrt{f}-3\right)\left(\sqrt{f}+3\right)$

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

$8h\:+\:9\:+\:13s\:+\:3$

$\frac{1}{2}a+2a\:-\:\frac{3}{4}a$

$3\int\left(sin\left(ln\left(7x\right)\right)\right)dx$