$\frac{7}{1-x^3}$
$\frac{x}{x}<-5x+\frac{2}{3}$
$\frac{y^2+2y-16}{y+5}$
$4x^2-18x+13$
$-1\:=\:4\cos^2x\:-\:2$
$\left(\frac{1}{4}y^3-3y^2+\frac{5}{6}\right)-\left(\frac{1}{2}y^3-5y+\frac{2}{3}\right)$
$\left(2x^{2n}-1\right)^2$
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