Barrons AP Calculus - David Bock

30. (E) S is the region bounded by y = sec x, the y-axis, and y = 4.

We send region S about the x-axis. Using washers, Δ V = π(R^2 − r^2 ) Δx. Symmetry allows

us to double the volume generated by the first-quadrant portion of S. So for V we have

A calculator yields 108.177.