$\lim_{x\to2}\left(\frac{x^2-2x}{x^2-4x+2}\right)$
$\:f\left(s\right)=s\left(1-s^2\right)^3$
$\frac{d^3y}{dx^3}=48x$
$4-16n^2$
$x+\sqrt{x-1}=1$
$\int x\cdot sen\left(x\right)\cdot\cos\left(nx\right)dx$
$\lim\:_{t\to\:0}\frac{\left(e^t\right)}{2^t}$
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