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+//signals and systems
+//Unilateral  Laplace Transform:Solving Differential Equation
+//example 4.17
+s= %s;
+syms t;
+// Re s>-1
+[A] = pfss(1/((s+1)*(s+5)));
+F1 = ilaplace(A(1),s,t)
+F2 = ilaplace(A(2),s,t)
+//F3 = ilaplace(A(3),s,t)
+F = F1+F2
+disp(F)
+//-5< Re s <-2
+[B] = pfss(-1/((s+2)*(s+5)));
+G1 = ilaplace(B(1),s,t)
+G2 = ilaplace(B(2),s,t)
+//F3 = ilaplace(A(3),s,t)
+G = G1+G2
+disp(G)
+\ No newline at end of file