$x+1,\:9-x^2$
$3x^3+8x^2+x$
$c^3-1$
$10mn\left(\frac{3x}{7}-1\right)$
$\lim_{x\to-4}\left(\frac{\sqrt{16-x^2}}{x-4}\right)$
$8y\cdot6x^4y^2$
$\sqrt{\frac{7}{25}}^{-1}$
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