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If a>0 and A,B,C are variable angles of △ABC, such that atanA+2atanB+3atanC=7a, then the minimum integral value of tan2A+tan2B+tan2C=

Answer» If a>0 and A,B,C are variable angles of ABC, such that atanA+2atanB+3atanC=7a, then the minimum integral value of tan2A+tan2B+tan2C=


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