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Manish Lakra
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Asked: 2025-02-01T09:18:48+00:00 In:

If f(x) = cos² x + sec ² x, then 

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100%f(x) ≥ 2 ( 1 voter )
0%f(x) < 1
0%f(x) = 1
0%1 < f(x) ≤ 2
Based On 1 Vote

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Enhance your understanding of Trigonometric Functions with these engaging MCQs from Chapter 3 of Class 11 NCERT Mathematics (CBSE 2024-25). This chapter covers key topics such as trigonometric identities, angles, radian and degree measures, domain and range of trigonometric functions, and their applications. These multiple-choice questions are designed to test your knowledge, improve problem-solving skills, and build a strong foundation. Ideal for exam preparation and self-study, these MCQs make learning trigonometry interactive, effective, and enjoyable.

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    1 Answer

    1. Choice (a) is correct. 
      Given that, f(x) = cos² x + sec² x
      We know that, A.M ≥ G.M
      (cos² x + sec ² x)/2  ≥ √cos² x. sec ² x
      ⇒ cos² x + sec ² x ≥ 2
      ⇒ f(x) ≥ 2
      This question related to Chapter 3 maths Class 11th NCERT. From the Chapter 3: Trigonometric Functions. Give answer according to your understanding.

      For more please visit here:
      https://www.tiwariacademy.com/ncert-solutions/class-11/maths/#chapter-3

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