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+clc;
+close();
+clear();
+//page no 556
+//prob no. 17.7
+l=127-70.2; //Difference in longitude
+L=40.5 //Latitude of New York
+d_km=35.786*10^3*sqrt(1+0.42*(1-cos(L*%pi/180)*cos(l*%pi/180)));
+mprintf('The distance is %.0f km \n',d_km)