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+   
+ // example 4.8
+ // caption: solution by quadratic interpolation;
+ 
+ // x-degrees:[10 20 30]
+ // hence x in radians is
+ x=[3.14/18 3.14/9 3.14/6];
+ f=[1.1585 1.2817 1.3660];
+ n=2;
+ 
+ 
+ P2=lagrangefundamentalpoly(x,f,n)
+ 
+ // hence from P2 ,the exact value of f(3.14/12) is 1.2246; 
+ // where as exact value is 1.2247;
+\ No newline at end of file