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B2=cos(r*l/2)*cos(n*l)/cos(n*l/2);
Q2=A2*sin(r*l)+B2*cos(n*l);
I1=int((cos(r*x))^2,0,l/2);
I2=int((A2*sin(r*x)+B2*cos(n*x))^2,l/2,l);
Nn=k1/a1*I1+k2/a2*I2;
y=Q2/Nn


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