so, i dont believe that i've done anything wrong, but i cant seem to get
a module to function properly, mabye i'm doing something stupidly
retartedly wrong, i dont know, but i've even typed it into irb and i get
the same thing.  ruby keeps telling me that my method is undefined.
heres the output from irb:

irb(main):001:0> module DSP
irb(main):002:1> include Math
irb(main):003:1> def sinc(x)
irb(main):004:2> sin(PI*x)/PI*x
irb(main):005:2> end
irb(main):006:1> end
=> nil
irb(main):007:0> DSP.public_instance_methods
=> [:sinc]
irb(main):008:0> DSP.sinc(0)
NoMethodError: undefined method `sinc' for DSP:Module
        from (irb):8
        from C:/Ruby192/bin/irb:12:in `<main>'
irb(main):009:0> sin 0
NoMethodError: undefined method `sin' for main:Object
        from (irb):9
        from C:/Ruby192/bin/irb:12:in `<main>'
irb(main):010:0> Math.sin(0)
=> 0.0
irb(main):011:0> exit

as you can see i even tried to call Math.sin the same way i called
DSP.sinc and that worked... idfk what's wrong, i've looked through what
stuff i have and it dosnt seem to make any sence so hopefully someone
with more programming knowhow can help me.

thx

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