AT1-AN1 means to subtract the contents of the cell AN1 from AT1, but I am not aware of any specific meaning of AT-AN in Excel.
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It is because the angles in Excel are measured in radians, not degrees. Often the default setting for measuring angles - even on scientific calculators - is the elementary mathematical degrees rather than the more advanced mathematicians' radians.180 degrees = pi radians.So Excel gives ATAN(1) = 0.7854 radians which is 0.7854*180/pi = 45 degrees.Note that all trig functions in Excel are based on angles measured in Radians NOT degrees.
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Daf-atan means 'all of a sudden'.
You mean this: const double PI = 4*atan(1); Well, it should be either const double PI = 3.14159265358979323846264338327950288 or double PI = 4*atan(1); /* without const */
atan
there the different pages you have in excel