_-substitution: definite integrals | AP Calculus AB | Khan Academy
What we’re going to do in this video is get some practice applying u-substitution to definite integrals. So let’s say we have the integral. So we’re going to go from x equals 1 to x equals 2, and the integral is (2x \times (x^2 + 1)^3 \, dx).
So, I alrea…