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diff --git a/1499/CH3/EX3.20/q20.sce b/1499/CH3/EX3.20/q20.sce
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+s=%s;
+syms k;
+
+num=k*(s+1);
+den=(s^2+4*s+13);
+t=syslin('c',num,den);
+clf;
+evans(t)