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JEE Mains · Maths · STD 11 - Trigonometrical equations

सामान्य संकेतो के साथ, त्रिभुज \(ABC\) में, यदि \(\angle A +\angle B =120^{\circ}, a =\sqrt{3}+1\) तथा \(b =\sqrt{3}-1\) हो, तो अनुपात \(\angle A : \angle B\) होगा

  1. A \(7 : 1\)
  2. B \(5 : 3\)
  3. C \(9 : 7\)
  4. D \(3 : 1\)
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Answer & Solution

Correct Answer

(A) \(7 : 1\)

Step-by-step Solution

Detailed explanation

\(a=\sqrt{3}+1\) \(b=\sqrt{3}-1\) \(\frac{\sin A}{\sin B}=\frac{\sqrt{3}+1}{\sqrt{3}-1}=\frac{3+1+2 \sqrt{3}}{2}=2+\sqrt{3}\) \(\frac{\sin A}{\sin (120-A)}=\sqrt{3}+2\) \(\frac{\sin A}{\sin 12 \cos A-\cos 12 \sin A}=\sqrt{3}+2\)…
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