$-5.62+\left(-12.9\right)$
$\frac{x^4-1}{x^3+x^2+x+1}$
$\left(3x-2y-z\right)^2$
$cos-x-sen-x$
$2\left(0-5\right)^2-8$
$\left(3p^2+1\right)\cdot\left(pq^2-4q+6p\right)$
$\lim_{x\to0}\left(\frac{x^2+6}{x^2-5x+6}\right)$
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