$\left(3x+4\right)^{2}$
$\frac{x^4-8x\:-1}{x^2-x-1}$
$6x^{-2}\cdot x^4$
$\frac{r}{5}-1>2$
$\frac{b-a}{n}+\frac{m-b}{d}+5a$
$w^2+2w+4w+2$
$\frac{1}{2cos^2x-1}$
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