$4x^2-4x+4$
$\left(6x^2+3x+2\right)\left(7x-x^2-4\right)$
$\lim_{x\to0}\left(\frac{x+sen\left(x\right)}{x-cos\left(x\right)}\right)$
$\left(3a^2b^3-\frac{4}{3}b\right)^2$
$\lim_{x\to1}\left(\frac{x^a-ax+a+1}{\left(x-1\right)^2}\right)$
$9\cdot x=-540$
$\left(a+b\right)\left(a^2+b^2\right)\left(a^4+b^4\right)$
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