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JEE Mains · Maths · STD 11 - Trigonometrical equations

यदि \(0 \leq x < \frac{\pi}{2}\) हे, तो \(x\) के उन मानों की संख्या जिनके लिए \(\sin x-\sin 2 x+\sin 3 x=0\) है

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