$\left(c+d+9\right)\left(c+d-9\right)$
$\frac{d}{dx}\left(\left(2x+1\right)^4\left(\frac{1}{3x}-2\right)^3\right)$
$-3\cdot42\cdot6$
$n2+8n+4$
$\frac{d}{dx}\left(x^{ax^3}\right)$
$\left(a^2-4b\right)^3$
$\frac{3}{4}x^3+4x^5$
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