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$\frac{d}{db}\left(9a^4-6a^2b^2+b^4\right)$
Learn how to solve problems step by step online. Factor the expression 9a^4+1*-6a^2b^2b^4. 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. Apply the product rule for differentiation: (f\cdot g)'=f'\cdot g+f\cdot g', where f=.