initial commit / add all books

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+//Example 7.4

+//Find the laplace transform 

+clc;

+close;

+syms t;

+b=4;

+ a=2;c=1;

+s=a+c*%i;

+X1=integrate((exp(-(b+s)*t)),'t',0,%inf);

+X2=integrate((exp(-(s-b)*t)),'t',-%inf,0);

+disp(X1);

+ disp(X2);

+X=X1+X2;disp(X)

+disp(real(s));

+disp('Since -b< real(s)<b,so the integral converges');