Differentiation rules
Rather than computing the limit definition every time, differentiation rules give shortcuts: the power rule says the derivative of x^n is n times x^(n-1), and the chain rule handles composite functions. For (2x + 1)^3, the chain rule gives 3(2x + 1)^2 times 2 = 6(2x + 1)^2, which checks out against expanding (2x+1)^3 = 8x^3 + 12x^2 + 6x + 1 and differentiating term by term to get 24x^2 + 24x + 6, the same result.
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