\[\begin {array} {1 1} (1)\;3+\sqrt 2 & \quad (2)\;\sqrt 2-1 \\ (3)\;1 & \quad (4)\;0 \end {array}\]

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\[\begin {array} {1 1} (1)\;3+\sqrt 2 & \quad (2)\;\sqrt 2-1 \\ (3)\;1 & \quad (4)\;0 \end {array}\]

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