$\frac{dy}{dx}=\:\left(\frac{x+y}{2x}\right)$
$\left(5+i\right)\left(5-i\right)$
$\sin\left(2x\right)\left(\cot\left(x\right)\right)\left(1-\cos\left(2x\right)\right)$
$\left(b-2\right)\left(b-4\right)$
$apc_{al_{a}}$
$\frac{5}{4.83}$
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