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

\(\alpha, \beta \in(0, \pi / 2)\) માટે ધારો ક \(3 \sin (\alpha+\beta)=2 \sin (\alpha-\beta)\) થાય અને એક વાસ્તવિક સંખ્યા \(k\) એવી છે કે જેથી \(\tan \alpha=k \tan \beta\) થાય. તો \(k\) નું મૂલ્ય ........... છે.

  1. A  \(-\frac{2}{3}\)
  2. B \(-5\)
  3. C \(\frac{2}{3}\)
  4. D \( 5\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(-5\)

Step-by-step Solution

Detailed explanation

\(3\sin \alpha \cos \beta+3 \sin \beta \cos \alpha\) \(=2 \sin \alpha \cos \beta-2 \sin \beta \cos \alpha\) \(5 \sin \beta \cos \alpha=-\sin \alpha \cos \beta\) \(\tan \beta=-\frac{1}{5} \tan \alpha \) \(\tan \alpha=-5 \tan \beta\) Not possible as \(\tan \alpha, \tan \beta\) are…
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