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+//Chapter 2: Antenna Basics
+//Example 2-4.1
+clc;
+
+//Calculation
+deff('y=f(x)','y=sin(x)')      //sin(theta)
+omega=intg(20*%pi/180,40*%pi/180,f)
+omega1=omega*(180/%pi)
+deff('y=f1(x)','y=1')
+omega2=intg(30,70,f1)
+omega_f=omega2*omega1          //omega (square degrees)
+
+//Result
+mprintf("The solid angle, omega is %.0f square degrees",omega_f)