$2x^5+3x^4y+4x^3y^2+2xy^4-x^4y+y^5$
$\frac{20h^{12}t^8}{5h^6t^4}$
$\frac{d}{dx}4\sqrt{x}-x$
$\left(\frac{9}{8}+\frac{a}{x^2}\right)^2$
$a^2+5a-14=0$
$\lim_{x\to\infty}\left(\frac{2^{3n+1}}{n^n}\right)$
$54\:+\:103\:-\:7\:-\:2$
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