show that: (x^l/x^-m)^l-m x (x^n/x^-l)^n-l x (x^m/x^-n)^m-n = 1
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show that: (x^l/x^-m)^l-m x (x^n/x^-l)^n-l x (x^m/x^-n)^m-n = 1
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