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diff --git a/22/CH4/EX4.5/ch4ex5.sce b/22/CH4/EX4.5/ch4ex5.sce
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+//signals and systems
+//example4.5
+// X(S) = s+3+5*exp(-2*s)/(s+1)*(s+2))  Re(s)>-1
+s1 =%s ;
+syms t s;
+[A]=pfss((s1+3)/((s1+1)*(s1+2))); //partial fraction of F(s)
+F1 = ilaplace(A(1),s,t)
+F2 = ilaplace(A(2),s,t)
+//F3 = ilaplace(A(3),s,t)
+Fa = F1+F2;
+disp(Fa,"f1(t)=")
+[B]=pfss((5)/((s1+1)*(s1+2))); //partial fraction of F(s)
+F1 = ilaplace(B(1),s,t)
+F2 = ilaplace(B(2),s,t)
+Fb = (F1+F2)*(%e^(-2*s));
+disp(Fb,"f2(t)=")
+disp(Fa+Fb,"f(t)=")
+\ No newline at end of file