$\frac{r}{\sqrt{r^2+1}}$
$\:\:\frac{5^3}{5^2}$
$\frac{2}{x}-4<\frac{4}{x}+1$
$8x\cdot5x\cdot\left(-3x\right)$
$\sin\left(x\right)\left(-1+\cos\left(x\right)\right)$
$\frac{x^2-3}{x^2+1}$
$9^7\cdot9^4$
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