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[" 45.If "a" is a real constant and "A,B," and "C" are variable "],[" angles and "sqrt(a^(2)-4)tan A+a tan B+sqrt(a^(2)+4)],[tan c=6a," then the least value of "tan^(2)A+tan^(2)B],[+tan^(2)C" is "],[[" a."6," b "10],[" c."12," d "3]]

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