$\left(8+ab\right)^2$
$\left(4a^2b+5b\right).\left(4a^2b-5b\right)$
$\int\frac{18x^2}{\sqrt{81-x^2}}dx$
$4x+20=4$
$\left(x-3\right)\left(x-9\right)$
$\lim_{x\to2}\left(\frac{2x^3-6}{x-x^2}\right)$
$\lim_{t\to0}\left(\frac{5^t-2^t}{t}\right)$
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