$\frac{x^3-4}{x-2}$
$7x^2y^3-12x^3y^4+20x^2y^8$
$-8+\left[5-\left(-16\right)\right]$
$9m+8\cdot9m-8$
$\frac{cos\left(\frac{\pi}{2}-x\right)-\cos\left(\frac{\pi}{2}\right)}{x}$
$2ab^2-a^3b$
$5^2\cdot5^9$
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