Integral of  x  from 0.0 to 1.0:
    Iterative method (step = 0.01):  0.5000000000000002
    Recursive method (epsilon = 1.0E-4):  0.5
Integral of  x^2  from -1.0 to 1.0:
    Iterative method (step = 0.01):  0.6666500000000013
    Recursive method (epsilon = 1.0E-4):  0.666748046875
Integral of  x^3  from 0.0 to 1.0:
    Iterative method (step = 0.01):  0.24998750000000045
    Recursive method (epsilon = 1.0E-4):  0.2500346712768078
Integral of  x^4 - 2x^2  from -2.5 to 2.5:
    Iterative method (step = 0.01):  18.496988055631086
    Recursive method (epsilon = 1.0E-4):  18.229269626194796
Integral of  x^5 - x^4 - 6x^3 + 4x^2 + 8x  from -2.5 to 2.5:
    Iterative method (step = 0.01):  2.705393452571584
    Recursive method (epsilon = 1.0E-4):  2.6041584119557895
Integral of  x^5 - x^4 - 6x^3 + 4x^2 + 8x  from -2.5 to 2.5:
    Iterative method (step = 0.1):  2.6395687500000116
    Recursive method (epsilon = 0.01):  2.6105535773142465
Integral of  sin(x)  from 0.0 to 3.141592653589793:
    Iterative method (step = 0.01):  1.999972991681736
    Recursive method (epsilon = 1.0E-4):  1.9998761900442124
Integral of  e^(-x^2)  from -3.0 to 3.0:
    Iterative method (step = 0.01):  1.7724159002839825
    Recursive method (epsilon = 1.0E-4):  1.772525395771758