help for trig functions (PR#199)

[wsi@gcal.ac.uk]

The help for trig functions (e.g. ?tan) says 
Description:

        These functions give the obvious trigonometric func-
        tions.  They respectively compute the cosine, sine,
        tangent, arc-cosine, arc-sine, arc-tangent and arc-tan-
        gent of two arguments.

1. I think it would be useful to state that the arguments are in radians
(not degrees).

2. only atan2 expects two arguments, the rest take one argument.

> version
           _                 
platform   i686-unknown-linux
arch       i686              
os         linux             
system     i686, linux       
status                       
status.rev 0                 
major      0                 
minor      64.1              
year       1999              
month      May               
day        8                 
language   R     

Bill Simpson

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