If a is real constant A ,Ba n dC are v...

If `a` is real constant `A ,Ba n dC` are variable angles and `sqrt(a^2-4)tanA+atanB+sqrt(a^2+4)tanc=6a ,` then the least vale of `tan^2A+tan^2b+tan^2Ci s` `6` b. `10` c. `12` d. `3`

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