x - \frac { 1 } { x } = 5 , \text { find } ( a ) x ^ { 2 } + \frac { 1 – InterviewSolution

1.	x - \frac { 1 } { x } = 5 , \text { find } ( a ) x ^ { 2 } + \frac { 1 } { x ^ { 2 } } ( b ) x ^ { 4 } + \frac { 1 } { x ^ { 4 } }
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