[" 8.If "a^(2)+b^(2)+c^(2)=1," then "ab+...

[" 8.If "a^(2)+b^(2)+c^(2)=1," then "ab+bc+ac" lies in the "],[" interval "],[[" (a) "[1,(2)/(3)],],[" (b) "[(-1)/(2),1],],[" (c) "[-1,(1)/(2)],],[" (d) "[2,-4]]]

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