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z^2=8e^(iπ/2) z=√8 e^(iπ/4+kπ),k=0,1 k=0時,z1=2√2e^(iπ/4)=2√2(√2/2+i√2/2)=2(1+i) k=0時,z2=-z1=-2(1+i)
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