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$\frac{d}{dx}\left(\sqrt{x}-\sqrt{y}\right)$
Learn how to solve differential calculus problems step by step online. Find the derivative of (x-y)/(x^1/2+y^1/2). Simplifying. 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}.