z=cos(theta) 0

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z=cos(theta)0z=cos(theta)0z=cos(theta)0theta=0:0.01:4*pi;Z2=Z(41:81);plot(theta,Z)figureplot(theta(4

z=cos(theta) 0
z=cos(theta) 0

z=cos(theta) 0
theta=0:0.01:4*pi;
Z2=Z(41:81);
plot(theta,Z)
figure
plot(theta(41:81),Z2)