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Learn how to solve product rule of differentiation problems step by step online.
$\frac{d}{dx}\left(80+90\cos\left(\frac{\pi}{3}x\right)\right)$
Learn how to solve product rule of differentiation problems step by step online. Find the derivative using the product rule d/dx(80+90cos(pi/3x)). Simplifying. 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=. The derivative of the constant function (80) is equal to zero.