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We could not solve this problem by using the method: Find the derivative using the quotient rule
The derivative of a sum of two or more functions is the sum of the derivatives of each function
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$\frac{d}{dx}\left(6x^3\right)+\frac{d}{dx}\left(-4x^2\right)+\frac{d}{dx}\left(9x\right)+\frac{d}{dx}\left(-1\right)$
Learn how to solve sum rule of differentiation problems step by step online. Find the derivative d/dx(6x^3-4x^29x+-1) using the sum rule. 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 (-1) is equal to zero. The derivative of the linear function times a constant, is equal to the constant. The derivative of the linear function is equal to 1.