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The derivative of a sum of two or more functions is the sum of the derivatives of each function
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$\frac{d}{dx}\left(xy\right)+\frac{d}{dx}\left(x\right)+\frac{d}{dx}\left(-2y\right)+\frac{d}{dx}\left(-1\right)$
Learn how to solve sum rule of differentiation problems step by step online. Find the derivative d/dx(xy+x-2y+-1) using the sum rule. The derivative of a sum of two or more functions is the sum of the derivatives of each function. The derivative of the constant function (-2y) is equal to zero. The derivative of the constant function (-1) is equal to zero. The derivative of the linear function is equal to 1.