T531b

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