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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