1. Chapter 6 Class 12 Application of Derivatives
  2. Serial order wise
  3. Ex 6.3
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Ex 6.3,9 - Chapter 6 Class 12 Application of Derivatives

Last updated at Dec. 16, 2024 by Teachoo

 

Transcript

Ex 6.3, 9 What is the maximum value of the function sin⁡𝑥+cos⁡𝑥? Let f(𝑥)=sin⁡𝑥+cos⁡𝑥 Consider the interval 𝑥 ∈ [0 , 2𝜋] Finding f’(𝒙) f’(𝑥)=𝑑(sin⁡𝑥 + cos⁡𝑥 )/𝑑𝑥 f’(𝑥)=cos⁡𝑥−sin⁡𝑥 Putting f’(𝒙)=𝟎 cos⁡𝑥−sin⁡𝑥=0 cos⁡𝑥=sin⁡𝑥 1 =sin⁡𝑥/cos⁡𝑥 1= tan⁡𝑥 tan 𝑥=1 Since 𝑥 ∈ [0 , 2𝜋] tan 𝑥=1 at 𝑥=𝜋/4 , 𝑥=5𝜋/4 in the interval [0 , 2𝜋] We have given the interval 𝑥 ∈ [0 , 2𝜋] Hence Calculating f(𝑥) at 𝑥=0 ,𝜋/4 , 5𝜋/4 & 2𝜋 Hence Maximum Value of f(𝑥) is √𝟐 at 𝒙 = 𝝅/𝟒
  1. Chapter 6 Class 12 Application of Derivatives
  2. Serial order wise

    3. Ex 6.3

    Examples →
Examples →
Chapter 6 Class 12 Application of Derivatives
Serial order wise

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo