$\lim_{x\to-\infty}\ln\left(\frac{x-2}{x-1}\right)$
$\left(x^2+8\right)\left(x^2-13\right)$
$cot\left(x\right)\:cos\left(x\right)\:+\:csc\left(x\right)\:sin2\left(x\right)$
$tangente$
$\frac{dy}{dx}=4x^3y^2$
$x^2+4x+4>0$
$\frac{\left(2x^2-x+2\right)}{\left(x^2\left(x^2-2x\right)\right)}$
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