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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-\frac{2}{5}\right)\left(x+\frac{2}{5}\right)+\left(x-\frac{2}{5}\right)\frac{d}{dx}\left(x+\frac{2}{5}\right)$
Learn how to solve differential calculus problems step by step online. Find the derivative of (x-2/5)(x+2/5). 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 (-\frac{2}{5}) is equal to zero.