$\cot\left(37\right)-\cot\left(53\right)$
$f\left(x\right)=\frac{4x-10}{x-2}$
$m^2+2m-120$
$9t^6-25$
$-5i-7.7i$
$\left(x+2b\right)\left(x+4b\right)$
$\sqrt[3]{5^2t^4}\sqrt[3]{5^4t^6}$
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