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$\frac{d}{dx}\left(x-9\right)$
Learn how to solve differential calculus problems step by step online. Find the derivative of y=x^2^1/2-9. Simplifying. 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. The derivative of the linear function is equal to 1.