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    Re: Need formulas for arcsin and arctan
    From: Bill B
    Date: 2006 Mar 29, 22:59 -0500

    Lu wrote:
    
    > On the other hand, regardless of whether an angle is expressed as 45
    > degrees or Pi/4 radians, its sine and cosine are the same.   So scanning
    > down a table that expresses angles in degrees for a sine or cosine that
    > matches your calculation should give you arcsine(x) in degrees.
    
    > Whoops, in first paragraph should have said "You get radians by
    > MULTIPLYING the angle in degrees by 2*Pi/360.
    
    I am sorry, I did not express myself clearly.  I understand the conversion
    from degrees to rads to grads, and why engineers etc. find radians more
    convenient.
    
    What I am trying understand:  Is "arcsine" the *exact* equivalent of "sine
    ^-1" outside the kingdom of the pocket calculator today?  Specifically, it
    seems "arcsine" was the angle in radians.  If so, has that changed?
    
    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?
    
    Thanks again
    
    Bill
    
    
    

       
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