$x^3-13x-12$
$\frac{\left(a-x\right)^2-9}{\left(a+x\right)+3}$
$8x^5-4x^5$
$\left(d^2+3d+2\right)y=e^{-x}+e^{-2x}$
$\lim_{x\to1}\left(\frac{1}{x}\right)^{x^2-1}$
$1.71^9$
$logx=4log2$
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