$x^3-2x^2-42x$
$7a^2b+2a^2b+4a^2b$
$\frac{d^2}{dx^2}\left(8\sqrt{x}\right)$
$\frac{x^2}{z^3}^4$
$4x^2-27x+18$
$sin\left(\frac{\pi}{2}-x\right)\left[csc\left(\frac{\pi}{2}-x\right)-sin\left(\frac{\pi}{2}-x\right)\right]$
$6^4.2^4$
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