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  1. Program Example12;
  2.  
  3. { Program to demonstrate the Cos function. }
  4.  
  5. Var R : Real;
  6.  
  7. begin
  8.   R:=Cos(Pi);    { R:=-1 }
  9.   R:=Cos(Pi/2);  { R:=0  }
  10.   R:=Cos(0);     { R:=1  }    
  11. end.
  12.  
  13.