Not enough input arguments.

I want to build a graph of this equation

where phi0=pi/3. and it's graph is like

but I am getting an error " not enough input arguments'. Please help me to resolve the error. Below is my code

clear all; close all; clc;
 phi=0.9*pi;
 phi0=pi/3;      
 PHI=0:2*pi;    
 %%PRC Type-1:
 z=[1-cos*(phi)]*exp*{3*[cos*(phi-phi0)-1]};
   % Plot the signal versus time:
   figure;
   plot(PHI,z);
  

Answer 1

[VBBV]

clear all; close all; clc;
%  phi=0.9*pi;
 phi0=pi/3;      
 phi=0:0.1:2*pi;    
 %%PRC Type-1:
 z=(1-cos(phi)).*exp(3*(cos(phi-phi0)-1));
   % Plot the signal versus time:
figure;
plot(phi,z);
axis([0 2*pi -0.5 0.8])

[Haya Ali]

Thanks a lot