📚 Fundamental Theorem of Calculus — Quick Explanation Here’s why this FTC Part 2 calculation doesn’t work: the integrand 1/x² is not continuous on the entire interval from –1 to 2. Since the function is undefined at x = 0, the Fundamental Theorem of Calculus Part 2 cannot be applied to this integral. If you’re learning FTC in Calc 1 or AP Calculus, this is an important idea to keep in mind when evaluating definite integrals. 👉 Full lesson: Examples of the Fundamental Theorem of Calculus Part 2