väli

f(x) = 1 / (1 + x^(2))
a = 2.278126689084895
b = 2.835048049745618
A2: 5
A3: 10
A4: 50
A5: 100
B2 = LowerSum(f, -2, 2, A2)
B3 = LowerSum(f, -2, 2, A3)
B4 = LowerSum(f, -2, 2, A4)
B5 = LowerSum(f, -2, 2, A5)