fifference equation plotting

Hi mates! I want to plot k=1.5 Xk = (Xk-1/2)+((25*Xk-1)/(1+Xk-1^2))+(8*cos(1.2*k)); and zk = xk^2/20
please let me know how to plot them. they are difference equations.
Please
Thanks a lot P

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2011-7-24

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