torb...@diku.dk (Torben Ægidius 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. The definition of a radian is length/length (or m/m) which simplifies to dimensionless. In fact, the units package in Lisp that I worked on actually handles this by making "radian" one of the dimensionless "units" precisely so that one can use degrees and radians with appropriate conversion. But they remain dimensionless. Interestingly, that also allows one to treat percent (%) as a dimensionless unit with a conversion factor of 1/100. -- Thomas A. Russ, USC/Information Sciences Institute
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