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+//Caption:expression_for_unit_step_response
+// example 11_11
+//page 481
+syms G1 G2 G3 H1 t;
+s=%s;
+G1=s+1;
+G2=1/(s+2);
+H2=1/(s*(s+1));
+H1=1/(s+2);
+a=G1/(1+G1*H1);
+b=a/(1+a*H2)
+y=b*G2;
+disp(y,"C(s)/R(s)=")
+//for unit step response R(s)=1/s;
+C=y*(1/s)
+c=ilaplace(C,s,t)
+disp(c,"expression_for_unit_step_response_is=")
+\ No newline at end of file