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JEE Mains · Maths · STD 11 - Trigonometrical equations

જો \(0\, \le \,x\, < \frac{\pi }{2},\)  તો \(x\) ની કિમતો ની સંખ્યા મેળવો ક જેથી સમીકરણ \(sin\,x -sin\,2x + sin\,3x=0,\) થાય.

  1. A \(2\)
  2. B \(1\)
  3. C \(3\)
  4. D \(4\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(2\)

Step-by-step Solution

Detailed explanation

\(\sin \,x - \sin \,2x\, + \,\sin \,3x\, = \,0\) \( \Rightarrow \,(\sin \,x + \,\sin \,3x)\, - \,\sin \,2x\, = \,0\) \( \Rightarrow \,2\,\sin x.\,\cos \,x\, - \,\sin \,2x\, = \,0\) \( \Rightarrow \,\sin \,2x\,(2\cos x\, - \,1)\, = \,0\) \( \Rightarrow \,\sin \,2x\, = \,0\) or…
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