(x-1/x)²=x²-2×x×1/x+(1/x)²=x²-2+1/x²=6-2=4,(x-1/x)²=4,(x-1/x)=+2,-2
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(x-1/x)²=x²-2×x×1/x+(1/x)²=x²-2+1/x²=6-2=4,(x-1/x)²=4,(x-1/x)=+2,-2