`conj', `real', `imag'
----------------------

real(COMP)
     :: COMP ̎.
imag(COMP)
     :: COMP ̋.
conj(COMP)
     :: COMP ̋𕡑f.

RETURN COMP
     f

   * fɑ΂, , , ߂.
   * , ɑ΂Ă.

     [111] A=(2+@i)^3; 
     (2+11*@i)
     [112] [real(A),imag(A),conj(A)];
     [2,11,(2-11*@i)]

