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[" 58.If "a^(2)+b^(2)+c^(2)=1" then the ...

[" 58.If "a^(2)+b^(2)+c^(2)=1" then the range of "ab+bc+ca],[" is "],[[" 1) "[1,alpha)," 2) "[-1/2,alpha)" 3) "(-1/2,1)" 4) "[-4/2,1]]]

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