Excel by default considers all degree arguments to be in radians. My work in
medical optics requires working in ordinary degrees. It is very cumbersome
and prone to error to convert every degree argument from radians to degrees.
It would be very convenient if one could specify the default calculation mode
for any given spread sheet as either radians or degrees.
This arose when I was trying to construct a spreadsheet that had to
manipulate the sine of an angle and realized that the answer given assumed
the angle was in radians and not standard degrees.

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