$\left(2y\cdot xy^4\right)^2$
$2x^2-11x-124$
$\left(4nx^5z^7\right)^3$
$\frac{40x^2y^6-30x^4y^4+20x^3y^3}{10xy^2}$
$4a^3b^3\cdot3a^{-4}b^{-3}$
$1-sen^2x=1$
$3x+5\ge2x-3$
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