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+//Chapter 2: Antenna Basics
+//Example 2-4.2
+clc;
+clear;
+
+//Calculation
+deff('z=f(x,y)','z=(cos(x)**4)*sin(x)*1')//Integration Function
+X=[0 0;%pi/2 %pi/2;%pi/2 0];
+Y=[0 0;2*%pi 2*%pi;0 2*%pi];
+[I,err]=int2d(X,Y,f)//Beam area (steradians)
+
+//Result
+mprintf('The Beam Area of the given pattern is %.2f sr',I)