mu = -2.72 (slider from -10 to 10, step 0.01)
sigma = 0.4
phi(x) = exp((-((x - mu) / sigma)^(2)) / 2) / (sigma * sqrt(2 * 3.141592653589793))
a = -2 (slider from -10 to 10, step 0.01)
b = -3 (slider from -10 to 10, step 0.01)
A: (a, phi(a))
B: (b, phi(b))
H: (a, 0)
K: (b, 0)
c = Segment(H, A)
d = Segment(K, B)
Prob = Integral(phi, a, b)
e = Integral(phi, -5, a)
f = Integral(phi, b, 5)