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+//Example 3.18
+clc
+clear
+t=0:0.01:10;
+for i=1:length(t)
+    x(i)=sin(i);
+    y(i)=2*x(i);
+    z(i)=0.5*y(i);
+end
+if (x==z) then
+    disp("The given system is invertible");
+else
+    disp("the Given system is non-invertible");
+end