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JEE Mains · Maths · STD 11 - Trigonometrical equations

एक त्रिभुज \(ABC\) में, \(\frac{ a }{ b }=2+\sqrt{3}\) तथा \(\angle C =60^{\circ}\) है, तो क्रमित युग्म \((\angle A , \angle B )\) बराबर है

  1. A \(({45^o},{75^o})\)
  2. B \(({105^o},{15^o})\)
  3. C \(({15^o},{105^o})\)
  4. D \(({75^o},{45^o})\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(({105^o},{15^o})\)

Step-by-step Solution

Detailed explanation

\(\frac{{\sin A}}{{\sin B}}\, = \,2\, + \,\sqrt 3 \) \(\frac{{\sin \left( {{{105}^\circ }} \right)}}{{\sin \left( {{{15}^\circ }} \right)}}\, = \,2\, + \,\sqrt 3 \) \(\frac{{\cos {{15}^\circ }}}{{\sin {{15}^\circ }}}\, = \,2\, + \,\sqrt 3 \)
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