kertausesimerekki

f(x) = If[0 ≤ x ≤ (2 * pi), cos((2 * x)) + 2]
a = Surface(f, 345.63588472342934*°, xAxis)
g: y = 5
b = Surface(t, 5 + ((5 - f(t)) * cos(s)), ((5 - f(t)) * sin(s)), t, 0, (2 * pi), s, 0, (2 * pi))