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因為z^4-4z^2+3=(z^2-1)(z^2-3), 且|z^2-1|>=|z^2|-1=3,|z^2-3|>=|z^2|-3=1, 所以|z^4-4z^2+3|>=3, 囙此|1/(z^4-4z^2+3)|
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