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+//Scilab Code for Example 9.6 of Signals and systems by
+//P.Ramakrishna Rao
+clc;
+clear;
+clear z x y t T;
+A=1;
+n=1;
+wo=2*%pi;
+theta=%pi/2;
+for t=-5:0.01:5;
+    x(n)=A*cos(wo*t+theta);
+    n=n+1;
+end
+t=-5:0.01:5;
+plot(t,x);
+title('x(t)');
+n=1;
+for T=-5:0.1:5;
+    z(n)=(A^2/2)*cos(wo*T);
+    n=n+1;
+end
+figure(1);
+T=-5:0.1:5;
+plot(T,z);
+title('Rxx(T)');
+xlabel('t in seconds')