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Apply the product rule for differentiation: $(f\cdot g)'=f'\cdot g+f\cdot g'$, where $f=
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$\frac{d}{dx}\left(x^2-9\right)\left(x^2-4\right)+\left(x^2-9\right)\frac{d}{dx}\left(x^2-4\right)$
Learn how to solve problems step by step online. Find the derivative of (x^2-9)(x^2-4). Apply the product rule for differentiation: (f\cdot g)'=f'\cdot g+f\cdot g', where f=. The derivative of a sum of two or more functions is the sum of the derivatives of each function. 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.