T531a

f: y = ℯ^((1 / 2 * x))
g: y = ℯ^(((-(1 / 2)) * x))
eq1: x = 1
a = IntegralBetween(f, g, 0, 1)
piirto1: PenStroke[]
b = Surface(t, (f(t) * cos(s)), (f(t) * sin(s)), t, 0, 1, s, 0, (2 * pi))
c = Surface(t, (g(t) * cos(s)), (g(t) * sin(s)), t, 0, 1, s, 0, (2 * pi))
d = Surface(1, ((((t - 1) * f(1)) - (t * g(1))) * cos(s)), ((((t - 1) * f(1)) - (t * g(1))) * sin(s)), t, 0, 1, s, 0, (2 * pi))