$\frac{x^2+x-1}{3-x}$
$\lim_{x\to0}\left(\frac{6\sqrt{5+x}-6\sqrt{5}}{x}\right)$
$\int\frac{2x-1}{x^2-x-20}dx$
$\left(\frac{3x+5}{x}\right)^{2x}$
$\int_0^{\infty\:}\left(e^{\frac{2x}{3}}e^{-x}\right)dx$
$x^2+y^2-225=0$
$\left(\frac{3}{5}x^2+\frac{2}{3}y^3\right)^2$
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