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+//Example 7.2
+//Find the laplace transform and Roc of the following signal
+clc;
+close;
+syms t;
+ x=exp(-3*t)+exp(-2*t);
+b=6;c=7;
+s=b+c*%i;
+X=integrate((exp(-(3+s)*t))+(exp(-(2+s)*t)),'t',0,%inf);
+disp(X); 
+disp(real(s));
+disp('Since real(s)>-2,so the integral converges');