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  1. Program Example4;
  2.  
  3. { Program to demonstrate the ArcTan function. }
  4.  
  5. Var R : Real;
  6.  
  7. begin
  8.   R:=ArcTan(0);      { R:=0 }
  9.   R:=ArcTan(1)/pi;   { R:=0.25 }
  10. end.
  11.