[R] acos(0.5) == pi/3 FALSE

[Ben Bolker]

  Time for folks to re-read the posting guide?

    * When responding to a very simple question, use the following algorithm:
         1. compose your response
         2. type 4*runif(1) at the R prompt, and wait this many hours
         3. check for new posts to R-help; if no similar suggestion, post your
response 
      (This is partly in jest, but if you know immediately why it is suggested,
you probably should use it! Also, it's a nice idea to replace 4 by the number of
years you have been using R or S-plus.) 

  [inspired by Romain Francois's similar post back in March]

  cheers
    Ben Bolker