$\cot\left(x\right)=\frac{\sqrt{3}}{3}$
$-9\left(3\right)+10-\left(3-4\right)$
$\frac{\left(x+1\right)\left(2x-1\right)+\left(x-3\right)}{\left(x-3\right)\left(2x-1\right)}$
$\ln\left(\sqrt{a^2-4}\right)$
$\frac{5}{d+7}=\frac{2}{b-5}$
$1-\cos\left(x+y\right)$
$\frac{-4}{8}+\frac{1}{2}$
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