阿摩線上測驗
題組內容
4. (10 points) It is known that the definite integral I =
from 0 to 1 can represent the volume of the solid formed by revolving the region bounded by the curve y = cos x and the lines y = 0, x = 0, x = 
about the y-axis.
(b) Evaluate the definite integral I =
dy. (5 points)