If α ∈ (0, π/2), then minimum value of 2x+tan2α2x is

  1. tan α 
  2. 0
  3. 2 tan α 
  4. None of these

Answer (Detailed Solution Below)

Option 3 : 2 tan α 
Free
HTET PGT Official Computer Science Paper - 2019
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60 Questions 60 Marks 60 Mins

Detailed Solution

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अवधारणा:

समांतर माध्य, ज्यामितीय माध्य, हरात्मक माध्य के सूत्र:

यदि A संख्या a और b का समांतर माध्य है 

⇔ A=a+b2

यदि G संख्या a और b का ज्यामितीय माध्य है 

⇔ G=ab

समांतर माध्य (AM) और ज्यामितीय माध्य (GM) के बीच संबंध

AM  ≥ GM

गणना:

Given that,

2x+tan2α2x

Let a = 2x, b = tan2α2x

We know that,

AM  ≥  GM

2x+tan2α2x2 2x×tan2α2x

⇒ 2x+tan2α2x ≥ 2 tan α 

⇒  2x+tan2α2x ∈ [2 tan α, ∞)

Hence, the minimum value is 2 tan α​. 

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