$-81x^4+9$
$\lim_{t\to-4}\frac{t+4}{t^3+4}$
$2x^2yz+yx^2$
$-110+25-\left(-12\right)+13-4$
$18.25-17.936$
$4\left[log\left(p-9\right)-log\left(p-1\right)-log\left(p+9\right)\right]$
$-\sqrt{4}$
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