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    Re: Research of a Free EXTENDED PRECISION Calculator Software toconvert radians into degrees
    From: Paul Hirose
    Date: 2015 Apr 29, 10:06 -0700

    Kermit, you already have an extended precision calculator. The Windows
    scientific calculator has 32 significant digits. I think this is not
    true of the default simple calculator. You must click View and select
    the scientific calculator.
    For example, here's what it gives for e^1
    In Windows 8.1 the calculator has a unit conversion function, but that
    seems to work in double (not extended) precision. When I convert 57
    degrees to radians, it says 0.9948376736367678, which is "only" 16
    digits. I copied that and pasted it into the calculator (you can copy
    from the calculator and paste into it), divided by pi, multiplied by
    180, and got 56.999999999999996628343696709571. So I guess you have to
    do the radian conversions via pi and 180 for full accuracy.

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