$\frac{-6x^{3}+4x+12x^{5}-4+6x^{2}}{1+2x^{3}}$
$2x^2-14x+12=0$
$-x^2-2x+6$
$\lim_{x\to2}\left(\frac{3}{x-2}\right)^{x-2}$
$\left(\cot^2x+1\right)\left(\sec^2x-1\right)$
$\frac{x^2-4x+4}{x-1}$
$25x^2-3=0$
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