$s^2-s+4$
$\log\left(x\right)+\log\left(x-1\right)=\log\left(3x+12\right)$
$144x^2-216x+81$
$\left(\frac{3}{5}x-5\right)^{3}$
$x^2+18x-19$
$\lim_{x\to\infty}\left(\frac{x\cdot sen\left(x\right)+2}{x^2sen\left(x\right)+x}\right)$
$x^2\left(9x^2+6x-12\right)$
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