theorem: suppose that & is the root of f(x) = 0 and / f, f , f in a neighbourhood & such as I are continuous and fix) to Vne I, in this case if nitial approximations are close enough to of the generated sequence fxça defined 1=0 secant formula is convergent to d- with lim lentil = C Tejp in the other words the convergence √5+1 2 oder is p 1,6 (‡o P=-

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