# Iteration functions for Fixed Point method

1. Apr 6, 2012

### carlosbgois

Hi there. I need to find some iteration functions for $x - 2\frac{sin(x)}{cos(x)}=0$, as $g(x)=2\frac{sin(x)}{cos(x)}$ does not converge. I can't find any others, maybe I didn't quite undertood how they're built. Any help will be appreciated

Thanks

2. Apr 7, 2012

### Staff: Mentor

You could check $g(x)=arcsin(\frac{x \cos(x)}{2})$ and $g(x)=arccos(\frac{2 \sin(x)}{x})$ and g(x)=arctan(x/2)? That is just your formula, with different ways to isolate an x at one side.