From: Brian Candler <b.candler@...>
Date: 2009-12-27T17:10:26+09:00
Subject: Re: Trig value errors

If the objective is for sin() to be equally inaccurate/imprecise around 
0.0 as it is around 1.0, then try this:

module Math
  def sin2(x)
    1.0 - (1.0 - sin(x))
  end
  module_function :sin2
end

>> include Math
=> Object
>> od = 2*PI/360
=> 0.0174532925199433
>> sin(od/1e8)
=> 1.74532925199433e-10
>> sin2(od/1e8)
=> 1.74532943653105e-10
>> sin(od/1e16)
=> 1.74532925199433e-18
>> sin2(od/1e16)
=> 0.0
>> 
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