"Thomas A. Russ" <t...@sevak.isi.edu> wrote in message
news:ymi1v7vgyp8....@blackcat.isi.edu...
torb...@diku.dk (Torben ZÆgidius Mogensen) writes:
Trigonometric functions do take arguments of particular units: radians
or (less often) degrees, with conversion needed if you use the "wrong"
unit.
But radians are dimensionless.
But they are still units, so that you can choose to use radians, degrees or
gradians for literals, so that functions that take angle arguments can
verify they are angles and not just numbers, and so that they can be
displayed appropriately.
You can't do all that if angles are just numbers.
The definition of a radian is length/length (or m/m) which simplifies to
dimensionless.
--
Bartc
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