$2x+7\le5x-8$
$6\:-\:4g\:-\:8$
$8x^3-16x^2+40x-80$
$x^2+y^2=32$
$\lim_{x\to-\pi}\left(\left(x+\pi\right)\left(\cot\:\left(x\right)\right)\right)$
$\lim_{x\to0}\left(\frac{1}{x\sin\left(x\right)}\right)$
$\left(-4sen\left(2x\right)\right)\left(cos\left(2x\right)\right)$
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