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+//Example 1.31<d>
+//check the given signL is PERIODIC OR NOT e^(-2*t)*u(t)
+clc ;
+t=-1:.01:1;
+x=exp(-2*t);
+plot (t,x);
+disp ('(a)this shows that the given signal is not periodic which gives w0=1+j,complex no. the frequency of signal can never be complex it must have real value');