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+//Example 7.11
+//Find the laplace transform .
+clc;
+t=-10:.01:10;
+for i=1:length(t)
+    if t(i)>=0 then
+        x(i)=exp(-2.*t(i))*sin(2*t(i));
+    else
+        x(i)=0;
+    end
+end
+s=%s;
+numfs=2;
+denfs=(s+2)^2+4;
+fs=syslin('c',numfs/denfs);
+fs1=csim('impulse',t,fs);
+disp(fs);
+f=scf(0);
+subplot(2,1,1);
+plot2d(t,x,2);
+xtitle('Phrasing');
+xgrid;
+subplot(2,1,2);
+plot2d(t,fs1,1);
+xtitle('Solution');
+xgrid;
+xs2jpg(0, 'problem109-plot-a.jpg');