$\lim_{x\to0}\left(-\frac{x^2}{e^x-1}\right)$
$\lim_{h\to0}\left(sen\left(3x^2+6xh+3h^2+8\right)\right)$
$2^{1-x}=8$
$\frac{1-\sin\:\left(x\right)}{1-\frac{1}{\sin\:\left(x\right)}}=-sinx$
$-\frac{5}{6}x-\frac{1}{9}x=-102$
$-7\left(5+3-4-7\right)-1$
$\frac{\left(x+5\right)}{x^2-2x-8}$
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