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+syms G1 G2 G3 G4 H1 H2
+
+a= G1*G4 //series
+b= (a)/(1-(a*H1)) //positive feedback
+c= (b*(G2+G3)) // G2 AND G3 are in parallel
+Y= c/(1+(c*H2)) // negetive feedback
+
+disp(Y,"C/R =") \ No newline at end of file