$49x^2x+42x+9$
$\frac{x^3-6}{x^4+6x^2+8}$
$ab^2\left(a-b-c\right)$
$x^3-6x^2-36x-40$
$\left(b+5\right)\left(b+2\right)$
$\frac{arcosx}{2}-\frac{\sqrt{4-x^2}}{x}$
$-1.5-\left(-10.92\right)$
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