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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(4^x- 5^x\right)x^{-2}+\left(4^x- 5^x\right)\frac{d}{dx}\left(x^{-2}\right)$
Learn how to solve problems step by step online. Find the derivative using the product rule d/dx((4^x-5^x)x^(-2)). Apply the product rule for differentiation: (f\cdot g)'=f'\cdot g+f\cdot g', where f=. The power rule for differentiation states that if n is a real number and f(x) = x^n, then f'(x) = nx^{n-1}. The derivative of a sum of two or more functions is the sum of the derivatives of each function. Apply the product rule for differentiation: (f\cdot g)'=f'\cdot g+f\cdot g', where f=.