$\begin {array} {1 1} (1)\;\large\frac{f_1-f_2}{f_2t_1-f_1t_2} & \quad (2)\;\large\frac{f_1+f_2}{f_1t_1+f_2t_2} \\ (3)\;\large\frac{f_1+f_2}{f_2t_1+f_1t_2} & \quad (4)\;\large\frac{f_1-f_2}{f_1t_1-f_2t_2} \end {array}$

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