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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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$\frac{d}{db}\left(9a^2\right)+\frac{d}{db}\left(-12ab\right)+\frac{d}{db}\left(15a^3\right)+\frac{d}{db}\left(-24a\right)+\frac{d}{db}\left(b^3\right)$
Learn how to solve differential calculus problems step by step online. Find the derivative of 9a^2-12ab15a^3-24ab^3. The derivative of a sum of two or more functions is the sum of the derivatives of each function. The derivative of the linear function times a constant, is equal to the constant. The derivative of the linear function is equal to 1. The derivative of a function multiplied by a constant is equal to the constant times the derivative of the function.