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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