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+//Example number 2.1, Page number 2.33
+
+
+clc;clear;close
+
+// Variable declaration
+I=1/2 // unitless
+
+// Calculation
+theta1=acos(1/sqrt(2))*(180/%pi) // radian
+theta2=acos(-1/sqrt(2))*(180/%pi) // radian
+// Result
+printf("theta=%.f degrees",theta1)
+printf("\ntheta=%.f degrees",theta2)
+printf("\n\n The value of theta can be +(or)- 45 degrees and +(or)-135 degrees.")