If \( \left|\begin{array}{ccc}6 i & -3 i & 1 \\ 4 & 3 i & -1 \\ 20 & 3 & i\end{array}\right|=x+i....
If \( \left|\begin{array}{ccc}6 i & -3 i & 1 \\ 4 & 3 i & -1 \\ 20 & 3 & i\end{array}\right|=x+i y \), then:
(1) \( x=3, y=1 \)
(2) \( x=1, y=3 \)
(3) \( x=1, y=3 \)
(4) \( x=0, y=0 \)
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