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If a is real constant A ,B and C are var...

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

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CENGAGE PUBLICATION-VECTOR ALGEBRA-All Questions
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