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F(x,) :
2F 2F 2F
s = -------; sy = --------; ty = - ------------- (12.1)
y2 x2 x y
s sy (12.1) ( ):
4F 4F 4F
------- + 2------------ + ---------- = 0(12.2)
x4 x2 y2 y2
(12.2) , . . , F(x,).
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