subexpressions (OT: math)

[Wildemar Wildenburger]

Gary Herron wrote:
> Of course not!  Angles have units, commonly either degrees or radians.
>
> However, sines and cosines, being ratios of two lengths, are unit-less.
>   
>> To understand it: sin() can't have dimensioned argument. It is can't
>> to be - sin(meters)
>>   
>>     
> No it's sin(radians) or sin(degrees). 
>   

NO!
The radian is defined as the ratio of an arc of circumfence of a circle 
to the radius of the circle and is therefore *dimensionless*. End of story.
http://en.wikipedia.org/wiki/Radian  and esp.
http://en.wikipedia.org/wiki/Radian#Dimensional_analysis

*grunt*