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[f tan^(-1)x+tan^(-1)y+tan^(-1)z=(pi)/(2...

[f tan^(-1)x+tan^(-1)y+tan^(-1)z=(pi)/(2)," the "],[xy+yz+zx=1],[x^(2)+y^(2)+z^(2)+2xyz=1],[x+y+z=xyz],[Sigma x+Sigma yz=1+xyz]

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