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z1=6;
z2=z1-1;
e=7.05;
f=r/e;
Df=120.6;
re=Df/2-e*f*(z1-1)-e;
a=sin(z1*tau);
b=f+cos(z1*tau);
m=atan(a./b);
p=m-tau;       %theta
c=sin(tau+p);
n=asin(f*c);
o=n-p;          %phi
g=(z1/z2)*o;    %psi

x1t=Q*sin(tau)+e*sin(z2*tau)-k*sin(p);       %ԭʼ³ÝÐÎ
y1t=Q*cos(tau)-e*cos(z2*tau)+k*cos(p);

x2t=x1t.*cos(o-g)-y1t.*sin(o-g)-e*sin(g);        %¹²éî³ÝÐÎ
y2t=x1t.*sin(o-g)+y1t.*cos(o-g)-e*cos(g);
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