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    %% Plot Cotangent Function
% Plot the cotangent function over the domain $-\pi<x<0$ and $0<x<\pi$ .

% Copyright 2015 The MathWorks, Inc.

x1 = -pi+0.01:0.01:-0.01; 
x2 = 0.01:0.01:pi-0.01;
plot(x1,cot(x1),x2,cot(x2)), grid on