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