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The least value of 6tan^2varphi+54cot^2v...

The least value of `6tan^2varphi+54cot^2varphi+18` is 54 when A.M.`geq` GM. Is applicable for `6tan^2varphi,54cot^2varphi,18` 54 when A.M.`geq` GM. Is applicable for `6tan^2varphi,54cot^2varphi,18` is added further 78 when `tan^2varphi=cot^2varphi` (I) is correct, (II) is false (I) and (II) are correct (III) is correct None of the above are correct

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