1.

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) lt x_(2) lt x_(3) " , then " 2x_(1) + x_(2) + x_(3)^(2)is equal to

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