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 21.2.10 Complex Number Operations
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  -- Scheme Procedure: make-rectangular real imaginary
  -- C Function: scm_make_rectangular (real, imaginary)
      Return a complex number constructed of the given REAL and
      IMAGINARY parts.
 
  -- Scheme Procedure: make-polar x y
  -- C Function: scm_make_polar (x, y)
      Return the complex number X * e^(i * Y).
 
  -- Scheme Procedure: real-part
      Return the real part of the number Z.
 
  -- Scheme Procedure: imag-part
      Return the imaginary part of the number Z.
 
  -- Scheme Procedure: magnitude
      Return the magnitude of the number Z. This is the same as `abs'
      for real arguments, but also allows complex numbers.
 
  -- Scheme Procedure: angle
      Return the angle of the complex number Z.
 
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