$\left(8a+6b\right)\left(3a+3b\right)$
$\frac{5x^5+3x^3-2x+4}{x-3}$
$\int\left(\frac{e^x}{e^x+e^{-x}}\right)dx$
$\lim_{x\to0}\left(\frac{1}{sen\left(x\right)}-\frac{1}{e^x-1}\right)$
$-3x^2+14x+80$
$\frac{x^6-1}{x-1}$
$\left(4a^2b+5b\right).\left(4a^2b-5b\right)$
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