$81y^2-16$
$\left(i-1\right)^3$
$\frac{d}{dx}\left(20x^{ln20x}\right)$
$64y^2+112y+49$
$\log m=400$
$\frac{-3kq}{r}-\frac{\frac{3}{2}k^2q}{r}$
$12x^5+14x^4-10x^3$
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