\[\begin {array} {1 1} (a)\;\frac{2}{T^2}=\frac{1}{T_1^2}+\frac{1}{T_2^2} & \quad (b)\;\frac{2}{T^2}=\frac{1}{T_1^2}+\frac{1}{T_2^2} \\ (c)\;2T^2=T_1^2T_2^2 & \quad (d)\;2T^2=T_1^2-T_2^2 \end {array}\]

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