$\frac{2b^4}{b^{-3}\cdot2ab^{-2}}$
$2x-1\ge1$
$x-2\cdot x-2$
$4x^2+24xy+36y^2$
$3x^4-7x^2$
$\cos^2x-\cos x=2$
$4x^2-12x+911$
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