$\frac{2}{x+1}=4-\frac{6}{x-1}$
$\frac{4a^2b^5}{-2ab}$
$2x^2-6x-8=0$
$\frac{\sin\left(5x\right)^3}{\cos\left(5x\right)^3}$
$x^{-2}y^{-2}\left(x^2\right)$
$2,316-7,854$
$\frac{\cot\left(x\right)}{\cos\left(x\right)}+\frac{1}{\sin\left(x\right)}=1$
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