Fundamental Theorem of Calculus Part 1 (FTC1): If f is continuous on [a, b] and F(x) = integral from a to x of f(t) dt, then F prime(x) = f(x).
How to apply it: FTC1 says differentiation undoes integration: the derivative of an accumulation function equals the integrand evaluated at x.
Course: AP Calculus AB · Unit: Integration and Accumulation of Change
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