$\left(x-12\right)\left(x-7\right)$
$tanx+cosx=\frac{1}{sinx\cdot cosx}$
$\int x^4-\frac{1}{x^2}+1dx$
$\lim_{x\to0}\left(\frac{x^2+49x}{7sen\left(x\right)}\right)$
$\frac{1+x}{1-x^2}$
$\frac{39z^4+39z^3}{13z^3}$
$-11x^2-4x^2$
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