From: not.my.real@email.address   
      
   On Thu, 17 Sep 2009 20:44:23 GMT, Jens Damsgård wrote:   
      
   > In Visual Basic you have the matematical function Atn(x) returning the   
   > arctangent.   
   > Can arcsin and arccos be derived as a function from arctangent or how   
   > can it be made?   
      
   It's right there in the help file. Search for "derived math functions". The   
   two you asked for are:   
      
     Arcsin(X) = Atn(X / Sqr(-X * X + 1))   
     Arccos(X) = Atn(-X / Sqr(-X * X + 1)) + 2 * Atn(1)   
      
   There are 19 more functions listed on the derived functions page; all but one   
   are trig functions.   
      
   ...for that matter, you could just go to Wikipedia and use the information   
   there:   
     http://en.wikipedia.org/wiki/Inverse_trigonometric_functions   
      
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