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

\(3 \cos \theta+5 \sin \left(\theta-\frac{\pi}{6}\right)\) का \(\theta\) के किसी भी वास्तविक मान के लिये अधिकतम मान है

  1. A \(\sqrt {19}\)
  2. B \(\frac{{\sqrt {79} }}{2}\)
  3. C \(\sqrt {34}\)
  4. D \(\sqrt {31}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\sqrt {19}\)

Step-by-step Solution

Detailed explanation

\(5\,\sin \,\left( {\theta \, - \,\frac{\pi }{6}} \right)\, + \,3\,\cos \,\theta \) \( = \,5\left( {\sin \,\theta \,\cos \frac{\pi }{6}\, - \,\cos \,\theta \sin \frac{\pi }{6}} \right)\, + \,3\cos \,\theta \)…
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