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+clc;
+//page 12
+//problem 1.1
+
+//Given signal u = 2*exp(-3*t) 
+
+//Since the function integral does not accept %inf as limit we need to use approximation by changing variables.
+
+//First the signal is to be expressed in terms of 'x'.
+
+function y=Signal(x); 
+y=2*exp(-3*x); 
+endfunction;
+
+//We then substitute x = tan(z), and then express the given signal wrt 'z' and not 'x'.
+
+function y=Gmodified(z); 
+x=tan(z); 
+y=(Signal(x))^2/(cos(z))^2; 
+endfunction;
+
+E = intg(0,atan(10),Gmodified)
+
+disp(E,'The energy of this signal is ');