sin(x) = 1/2
k = 4
4
0.523598775598299
2.61799387799149
k1 = 4.0 x1 = 8.901179185171081
k2 = 4.0 x2 = 2.617993877991494
k3 = 4.0 x3 = -9.948376736367678
k4 = 4.0 x4 = -5.759586531581288
k5 = 4.0 x5 = 6.806784082777885