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x-1/x=2 兩邊平方 x^2-2+1/x^2=4 x^2+1/x^2=6 x^2+2+1/x^2=8 所以(x+1/x)^2=8 所以x+1/x=±2√2 所以x^2-1/x^2 =(x+1/x)(x-1/x) =±4√2
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