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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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$\frac{d}{dx}\left(x^2\right)+\frac{d}{dx}\left(9\left(y-1\right)^2\right)+\frac{d}{dx}\left(-9\right)$
Learn how to solve sum rule of differentiation problems step by step online. Find the derivative d/dx(x^2+9(y-1)^2+-9) 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 (9\left(y-1\right)^2) is equal to zero. The derivative of the constant function (-9) is equal to zero. The power rule for differentiation states that if n is a real number and f(x) = x^n, then f'(x) = nx^{n-1}.