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  Transformations
  
   
   Transformations and argument simplifications
   Argument involving basic arithmetic operations 
   
   Addition formulas
   Translation by half-periods 
   
   Multiple arguments
   
    
    Argument involving numeric multiples of variable
    Double angle formulas Triple angle formulas Argument involving symbolic multiples of variable 
   
   Related transformations
   Halving half-period Third of half-period General fractions of half-periods |