2026 AP Calculus BC Part B

This is the Solution for the AP Calculus exam for 2026 part B. I post it here because the question #3 is so clever: to determine f(4) and f(-2) which is larger, the fundamental theorem of calculus is applied. One has to estimate the area under the derivative curve, using the concavity of the derivative curve. I did all AP calculus problems before, this is the most ingenuous one.