1. 

   olenochka New Member

   Arccos (-1)-2arcctg0

    

   olenochka, 10 фев 2010

   #1
2. 

   Andrew-Andrew New Member

   Arccos(-1)
   arccos(-1)=t
   cost=-1, t принадлежит отрезку [0;п]
   t=п
   arccos(-1)=п
   
   arcctg0
   ctgt=0
   t=п/2
   
   arccos(-1)-2arcctg0=п-2*п/2=п-п=0

    

   Andrew-Andrew, 10 фев 2010

   #2