method

cos

v2_2_9 - Show latest stable - Class: CMath

cos(z)

public

returns the cosine of z, where z is given in radians

CMath.cos(1 + 1i) #=> (0.8337300251311491-0.9888977057628651i)

# File lib/cmath.rb, line 189
  def cos(z)
    begin
      if z.real?
        cos!(z)
      else
        Complex(cos!(z.real) * cosh!(z.imag),
                -sin!(z.real) * sinh!(z.imag))
      end
    rescue NoMethodError
      handle_no_method_error
    end
  end

cos

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