Integral of func with 2^(n-1) points Actual value of integral is -0.479158 n approx. integral 1 0.905772 2 -0.020945 3 -0.361461 4 -0.449584 5 -0.471756 6 -0.477308 7 -0.478696 8 -0.479043 9 -0.479129 10 -0.479149 11 -0.479153 12 -0.479154 13 -0.479153 14 -0.479153