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Consider the following cost function
$C(Q)=aQ^b+c$, for $a>0$, $b>1$, $c\\geq 0$
and the average cost function defined in the usual way via $A(y)=\\frac{C(y)}{y}$.
Find the derivative of $A(Q)$ w.r.t. $Q$.
a*b*Q^{b-1}
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