Solve for F_R
F_{R}=\sqrt{F_{x}^{2}+F_{y}^{2}}
Solve for F_x
F_{x}=\sqrt{F_{R}^{2}-F_{y}^{2}}
F_{x}=-\sqrt{F_{R}^{2}-F_{y}^{2}}\text{, }F_{R}\geq |F_{y}|
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