$\frac{d}{dx}\left(2x+1\right)^3$
$\frac{d}{dx}\left(\sqrt{\frac{x\left(x+2\right)}{\left(2x+1\right)\left(5x+3\right)}}\right)$
$\frac{d}{dx}\left(\arcsin\left(1-2x^2\right)\right)$
$\frac{d}{dx}\left(\sqrt{x+1}\right)$
$\frac{d}{dx}\left(x\sqrt{x^2+1}\right)$
$\frac{d}{dx}\left(x^2+y^2\right)$
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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