$\frac{d}{dx}\left(2x+1\right)^3$
$20+90+51$
$\left(-9\right)-\left(-4\right)$
$\left(-9\right)-\left(-6\right)$
$8-\left(-1\right)$
$-5-9$
$3-\left(-6\right)$
The sum rule is a method to find the derivative of a function that is the sum of two or more functions.
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