Trigonometric and Hyperbolic Functions in the Natural Units Environment
In the Natural Units environment, the arguments for the trigonometric or hyperbolic functions can be unit-free, in which case the argument is assumed to be given in terms of radians, or multiplied by a unit of angle with the dimension length/length(radius). An error is returned if the dimension of the argument is not an angle.
If the argument has a unit of angle, it is converted to a free expression in the call to the corresponding global function. Therefore, a call to sin(7*deg) returns as sin(7/180*Pi), because 1 degree equals π180 radians.
For other properties, see the global functions in the trig help page.
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