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+syms A s t
+
+G=(A)/(s+A);
+R=1/s; //unit step input
+C=G*R;
+c=ilaplace(C,s,t);
+disp(c," c(t) = ")
+
+A=-log(1-0.95)/60 //system attains 95% of final value at t=60
+disp(A," A = ")
+
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