From: &noreply@axelvogt.de   
      
   On 20.06.2015 18:55, Richard Fateman wrote:   
   ...   
    > It is also not so easy to specify the choice.  How would you specify   
   sqrt(1-cos(x)^2) ?  The "positive one"  would be   
    > sin(x)  maybe??  But sin(x) oscillates between pos and neg, so it is not   
   "positive".   
   ...   
   A neat point. Maple takes csgn(sin(x))*sin(x) resp. abs(sin(x)) over the Reals   
      
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