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diff --git a/656/CH1/EX1.3/example1_3.sce b/656/CH1/EX1.3/example1_3.sce
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+// q be the charge in coulombs and i be the current in Ampere
+ 
+// i is given by i=(3*t^2-t)
+ 
+//charge is to be found between t=1s and t=2s
+ 
+integrate('3*t^2-t','t',1,2);
+ 
+// the charge between 1s and 2s is 5.5 coulombs
+ 
+q=ans;
+ 
+disp("q=")
+disp(q)
+units='Coulombs C'
+q=[string(q) units];
+disp(q)
+// in coulombs
+
+
+// the charge is 5.5 coulombs