$1.47\cdot3.9$
$4x+6\le6x+12$
$\frac{sin2\left(x\right)-cos2\left(x\right)+1}{\cos2\left(x\right)+sin2\left(x\right)-1}$
$\frac{2x^4+3x^3-2x^2+ax+b}{x^2-x-2}$
$7x^3y^4-21x^4y^2+49x^2y^2$
$8b-4$
$2n^3\cdot\left(n^4\right)^4$
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