\[\begin {array} {1 1} (1)\;\frac{2 \lambda_1}{\lambda_2} & \quad (2)\;\frac{2 \lambda_2}{\lambda_1} \\ (3)\;\frac{ \lambda_1}{2\lambda_2} & \quad (4)\;\frac{\lambda_2}{2\lambda_1}\end {array}\]

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