$\lim_{x\to0}\:9$
$\left(t-9\right)\left(t-5\right)$
$2\left(4r+10\right)+3r$
$\int\frac{\sqrt{\left(81-x^2\right)}}{x}dx$
$\left(x^{11}\right)^3$
$-21ab+52ab-6ab+48ab-31ab+36ab-ab-23ab$
$sin\left(x+\frac{1}{4}\right)\pi-sin\left(x-\frac{3}{4}\right)\pi$
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