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JEE Mains · Maths · STD 11 - 3. trignometrical ratios,functions and identities

\( (cos^{2}\theta-6sin\theta~cos\theta+3~sin^{2}\theta+2) \) का न्यूनतम मान ___ है।

  1. A -1
  2. B \( 4+\sqrt{10} \)
  3. C \( 4-\sqrt{10} \)
  4. D 1
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Answer & Solution

Correct Answer

(C) \( 4-\sqrt{10} \)

Step-by-step Solution

Detailed explanation

\( f(\theta)=\frac{1+cos 2\theta}{2}-3~sin 2\theta+3(\frac{1-cos 2\theta}{2})+2 \) \( f(\theta)=4-3~sin 2\theta-cos 2\theta \) \(f(\theta) \in[4-\sqrt{10}, 4+\sqrt{10}]\)
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