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[" 14.If "a^(2)+c^(2)-3a^(2)=0," then "c...

[" 14.If "a^(2)+c^(2)-3a^(2)=0," then "cot B+cot C-cot A" is equal to: "],[[" (a) "1," (b) "(cb)/(4Delta)," (c) "0," (d) "(ac)/(4a)]]

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