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+//Example 2.41 (a)
+//MAXIMA SCILAB TOOLBOX REQUIRED FOR THIS PROGRAM
+//Z- transform of n.(-1)^n u(n) 
+clear;
+clc ;
+close ;
+syms a n z;
+x =(-1) ^n;
+X= symsum (x*(z^(-n)),n ,0, %inf )
+Y = diff (X,z);
+//Display the result in command window
+disp (Y,"Z-transform of n.(-1)^n u(n)  is:");
+\ No newline at end of file