Fixed Point Iteration with order of convergence

Show that the fixed point iteration

x(n+1)=xn-tan(xn)+1/2tan^3(xn),

with x0 sufficiently close to pi, converges to x=pi with order of convergence equal to 3.

How do code this so I can get this to display in a table so I can show how it converges? Do have to use the while command?

disp('n       xn         x(n+1)')