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AP EAMCET20224 Jul 2022Evening ShiftMathematicsTrigonometric EquationsActual

In a triangle A B C , tan A 2 tan B 2 tan C 2 2 ≤

Options

  1. A1 27
  2. B1 18
  3. C1 9
  4. D1 3

Correct answer

A. 1 27

Step-by-step solution

We know that for ∆ A B C tan A 2 tan B 2 + tan B 2 tan C 2 + tan C 2 tan A 2 = 1       . . . . i For triangle, tan A 2 ,   tan B 2 ,   tan C 2 > 0 Now, AM ≥ GM ⇒ tan A 2 tan B 2 + tan B 2 tan C 2 + tan C 2 tan A 2 3 ≥ tan A 2 tan B 2 × tan B 2 tan C 2 × tan C 2 tan A 2 1 3 ⇒ tan 2 A 2 tan 2 B 2 tan 2 C 2 1 3 ≤ 1 3 ⇒ tan A 2 tan B 2 tan C 2 2 ≤ 1 27

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