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$\frac{d}{dx}\left(\left(\frac{9}{5}+x^4\right)\left(-\frac{1}{5}-x^4\right)\right)$
Learn how to solve differential calculus problems step by step online. Find the derivative of (4/5+x^4+1)(4/5-x^4+-1). Simplifying. 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.