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+// Problem 8.20,Page no.219
+
+clc;clear;
+close;
+
+alpha=30 //degree 
+E=200*10**9 //Pa
+G=80*10**9 //pa 
+
+//Calculations
+
+//For alpha=30 //Degree
+//dell=64*W*R**3*n*sec(alpha)*(d**4)**-1*(cos(alpha)**2*G**-1+2*sin(alpha)**2*E**-1)
+//Now substituting values in above equation we get
+
+//dell_1=64*W*R**3*n*(d**4)**-1*1330*(10**9)**-1  (equation 1)
+
+//For alpha=0 //Degree
+//dell=64*W*R**3*n*sec(alpha)*(d**4)**-1*(cos(alpha)**2*G**-1+2*sin(alpha)**2*E**-1)
+//Now substituting values in above equation we get
+
+//dell_2=64*W*R**3*n*(d**4)**-1*1250*(10**9)**-1  (equation 2)
+
+//subtracting equation 1 and equation 2 we get
+//Let dell_1-dell_2=X
+//X=64*W*R**3*n*(d**4)**-1*80*(10**9)
+
+//Let Y=X*dell_1**-1*100
+Y=80*1330**-1*100 //% under estimation of axial extension
+
+//Result
+printf("%% under estimation of axial extension is %.2f",Y)