x+1/x-1 + x-1/x+1 =8(x+2)/x^2-1
x+1/x-1 + x-1/x+1 =8(x+2)/x^2-1
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admin2020-08-20 19:20:532020-08-20 19:20:53x+1/x-1 + x-1/x+1 =8(x+2)/x^2-1