$\lim_{t\to0}\left(\frac{e^t-1}{t}\right)$
$1-\left(2x-3\right)^2$
$\left(r^2-8\right)\left(r^2+8\right)$
$-2b-b$
$121 x ^ { 2 } - 81$
$\sqrt{9}\sqrt{7}$
$\frac{\left(15+8+8+10-11\right)}{5}$
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