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$\frac{d}{dx}\left(\sqrt{x+9}\right)$
Learn how to solve differential calculus problems step by step online. Find the derivative of y=(x+3^2)^1/2. Simplifying. 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 sum of two or more functions is the sum of the derivatives of each function. The derivative of the constant function (9) is equal to zero.