$\frac{\left(x^{15}+1\right)}{\left(x^2+x+1\right)}$
$\lim_{x\to0.1}\left(\frac{sen2x}{x}\right)$
$\lim_{x\to1}\left(\frac{\sin\left(2x-2\right)}{x-1}\right)$
$4\sec\left(\frac{\pi}{4}\right)^2$
$\frac{5}{x+2}-\frac{2x-1}{5}$
$-11\le1-3x$
$y\left(x\:+\:2y\right)\:$
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