' File XIX_dbl11

' Given r^2 = 4 cylinder (circle extended in positive z direction).
' Given z = 9 - r^2 paraboloid that lies inside the cyclinder.
' Find its volume.
pi = 3.14159

H{x,r} = 9 - r^2
F{x,r} = H{x,r}*r
' ******************************************
a = 0  :  b = 2pi  :  C{x} = 0  :  D{x} = 2
n = 10  : m = n

v = dblInt[F, C, D, {a, b, n, m,y}]
ex = 28pi


