$3pq-2pr+4pq-3pr-pq$
$\frac{6}{\tan45}$
$\left(2x^2+3x-23\right)-\left(4x^2-5x+7\right)+\left(x-4\right)$
$4+6b+9b^2$
$-6754-2345$
$\lim_{x\to0}\left(e^x-1\right)\left(\cot\left(x\right)\right)$
$\int\left(3x^3+x^2-x+2\right)dx$
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