$sen\left(2x\right)\left(\csc\left(2x-2\right)\right)$
$40x^2+80x-200<120$
$\lim_{x\to\infty}\left(\frac{x+sin\left(x\right)}{x-sin\left(x\right)}\right)^{2x}$
$820+-6$
$- 2,8 - - 15$
$\left(2x+\frac{1}{5}\right)\left(2x-\frac{1}{5}\right)$
$\left(2y\:-\:3\right)^2$
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