$\begin {array} {1 1} (1)\;F_3-F_1+F_2 & \quad (2)\;F_3-F_1-F_2 \\ (3)\;\sqrt{(F_3-F_1)^2+F_2^2} & \quad (4)\;\sqrt{(F_3-F_1)^2-F_2^2} \end {array}$

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