$4x^4-16$
$-7\left|-2\right|$
$70k^5+7k^4+21k^3$
$sen\infty+cos\pi$
$\sqrt[2]{50}$
$\cos^2x\sec^2x=1$
$\lim_{x\to infinitp}\left(\frac{x-2x^2}{2x^2+5x}\right)$
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