$9x^6-63x^3-90x^2$
$16-x^3$
$\left(ac^3+1\right)\left(ac^3-4\right)$
$-\frac{16}{-1}$
$4+0^4-0+2$
$\int\frac{30x^2}{\sqrt{81-x^2}}dx$
$\frac{5x^4+3x-6x^2-6}{x+3}$
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