Jawabanmu

2014-02-14T23:01:40+07:00
V = \pi  \int\limits^4_0 {f(y)^{2}- g(y)^{2} } \, dy

V= \pi  \int\limits^4_0 ({y- \frac{y}{2} }) \, dy

V= \frac{ \pi }{2}  \int\limits^4_0 {y} \, dy

integralkan lalu masukkan y = 4 dan y = 0

V =  \frac{ \pi }{2} (8-0)

V=4 \pi

CMIIW :3