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### `conj`, `real`, `imag`

`real(comp)`
  :: comp の実数部分.
`imag(comp)`
  :: comp の虚数部分.
`conj(comp)`
  :: comp の共役複素数.

return comp
  複素数

- 複素数に対し, 実部, 虚部, 共役を求める.
- これらは, 多項式に対しても働く.

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

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