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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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$\frac{d}{dx}\left(2x^2\right)+\frac{d}{dx}\left(-9\right)$
Learn how to solve differential calculus problems step by step online. Find the derivative of (1+xy)^3=2x^2-9. 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 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}.