The least value of 6\tan ^{ 2 }{ \phi  } +54\cot ^{ 2 }{ \phi  } | Filo
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Class 11

Math

Algebra

Sequences and Series

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The least value of is 
(I) when is applicable for
(II) when is applicable for is added further
(III) when

  1. (I) is correct, (II) is false
  2. (I) and (II) are correct
  3. (III) are correct
  4. none of the above are correct
Correct Answer: Option(b)
Solution:
by applying in we get


Now equality holds when


Hence, the statements I and II are correct.
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