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+clear
+//
+//applying kvl to circuit
+i=0.414
+vth=12-4*0.414 //using vth formula
+//when terminals a and b are short circuited applying kcl to node a gives isc=5*i
+isc=2.07
+rth=vth/isc
+printf("\n rth= %0.1f A",rth)