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$\frac{d}{dx}\left(3\left(x+1\right)^2+x\right)$
Learn how to solve differential calculus problems step by step online. Find the derivative of 3(x+1)^2+x+1+-1. Simplifying. The derivative of a sum of two or more functions is the sum of the derivatives of each function. The derivative of the linear function is equal to 1. The derivative of a function multiplied by a constant is equal to the constant times the derivative of the function.