>>>>> "P" == Paul Brannan <pbrannan / atdesk.com> writes:

P> irb(main):006:0> sin(0)
P> => 0.0

pigeon% ruby -e 'module Math public :sin end; include Math; p self.sin(0)'
0.0
pigeon% 

 In your example, you use it like a private method

Guy Decoux