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+//===========================================================================
+//chapter 7 example 10
+
+clc;clear all;
+
+//variable declaration
+V1 = 200; //voltage across an inductive load in volts
+V2 = 180; //voltage across an nono- inductive resistor in volts
+V3 = 300; //voltage across the two in series in volts
+
+//calculations
+x = ((V3^2)-(V1^2)-(V2^2))/(2*V1*V2); //cos(phi)
+
+//result
+mprintf("power factor cos (phi) = %3.3f lagging",x);
+