trig_secant2

trig_secant2
  Use the secant method to search for a root of the trig function.

  F(0) = 1
  F(1) = -0.459698
2: Estimated convergence rate = 1.57182
3: Estimated convergence rate = 1.59648
4: Estimated convergence rate = 1.52134
5: Estimated convergence rate = 1.676

  After 5 iterations:
  F(0.739085) = 2.66787e-13

  it <= itmax?  true
  |a-b| <= xtol?  true
  |f(b)| <= ftol?  true
diary wiggle_secant2.txt