$xy^2-y=y^3$
$x^5+2x^4-16x-32$
$\sqrt { \frac { u } { x } }$
$\frac{1.39}{752}\:x\:20000$
$a^2+3-b\cdot a^2+3$
$\lim_{x\to\infty}\left(1+\frac{1}{n}\right)^{kn+a}$
$\int\frac{3}{x^3\sqrt{x^2+4}}dx$
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