$\left(4b^2-5b+6\right)\left(10b^3+8b^2-4b-18\right)$
$4x^2-7x+7$
$\frac{d^2}{dx^2}\left(\frac{1}{1-2x}\right)$
$\frac{\left(5y^2-6y+7\right)}{5y-1}$
$10^2.4^3$
$\frac{1-\cos^{2}\left(180^{\circ}-x\right)}{\cos x\cdot\sin\left(90^{\circ}-x\right)}$
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