}// get the four argument valuesdoublelat1 =sqlite3_value_double(argv[0]);doublelon1 =sqlite3_value_double(argv[1]);doublelat2 =sqlite3_value_double(argv[2]);doublelon2 =sqlite3_value_double(argv[3]);// convert lat1 and lat2 into radians now, to avoid doing it twice belowdouble...