solve 8=(x+f)^2+(1/x+f)^2+(x-f)^2+(1/x-f)^2-2sqrt{(x+f)^2+(1/x+f)^2}sqrt{(x-f)^2+(1/x-f)^2} for fsolve 8=(x+f)^2+(1/x+f)^2+(x-f)^2+(1/x-f)^2-2sqrt{(x+f)^2+(1/x+f)^2}sqrt{(x-f)^2+(1/x-f)^2} for f

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