Gain intuition into the second part of the fundamental theorem of calculus in this 12-minute video lesson. Explore how to calculate definite integrals using antiderivatives and understand the relationship between F(b) - F(a) and the definite integral of a function f from a to b. Learn why this theorem is true and its significance in calculus. Part of Khan Academy's AP Calculus AB series, this video provides a clear explanation of this crucial concept, helping students master the fundamental theorem of calculus and its applications in integration.