$\ln\left(\frac{x+2}{x-1}\right)$
$28ab-63a-12b^2+27b$
$\frac{dy}{dx}=_{\left(x+1\right)^2}$
$\frac{r+bs}{ar^2+bsr}$
$-4x^2+5x+1=0$
$\left(3x^4\right)\left(2x^4\right)$
$-6-\left(5+3-15\right)$
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