$\lim_{x\to0}\left(\frac{xsen\left(x-1\right)}{2x^2-x-1}\right)$
$\left(2x^{2a-1}\right)\left(x^{4-a}\right)$
$-7c+-4c-8c^2$
$n^2-n+1$
$\ln\left(\frac{e^2}{x}\right)$
$c^2+6c+9$
$-17-\left(-11\right)$
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