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Let x(1) , x(2) , x(3) be the solution o...

Let `x_(1) , x_(2) , x_(3)` be the solution of `tan^(-1) ((2x + 1)/(x +1 )) + tan ^(-1) ((2x - 1)/( x -1 )) = 2 tan ^(-1) ( x + 1) "`
where ` x_1 < x_2 < x_3 ` , then
`2x_(1) + x_(2) + x_(3)^(2) ` is equal to

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