method

cos

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cos(z) public

Redefined to handle a Complex argument.

# File lib/complex.rb, line 463
  def cos(z)
    if Complex.generic?(z)
      cos!(z)
    else
      Complex(cos!(z.real)*cosh!(z.image),
              -sin!(z.real)*sinh!(z.image))
    end
  end

cos

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