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    Re: Need formulas for arcsin and arctan
    From: Frank Reed CT
    Date: 2006 Mar 30, 02:33 EST

    Bill you wrote:
    "For example, several decades  ago--unless you could walk or stand on
    water--you could not walk or stand on  a "dock."  (Hence the term "dry
    dock").  Gourmet was a noun, not an  adjective.  Was arcsine exclusively
    refering to angle in radians, and is  that the case or not today?"
    My opinion: no and no. I don't think that  this term was ever limited
    semantically in the way you suggest. In any case, it  isn't today. So if someone asks
    me for the "arcsine" or the "inverse sine" or  "sin^-1"  of some number, e.g.
    0.7071068, I can answer "45 degrees" or  "pi/4". Both are correct in today's
    usage and, I believe, have been for a long  time. Naturally, a mathematician
    will be more likely to reply with the angle as  a pure number (sometimes called
    "radians") while an engineer may be more likely  to reply in degrees.
    42.0N 87.7W, or 41.4N  72.1W.

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