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JEE Mains · Maths · STD 11 - Trigonometrical equations

माना \(S =\left\{\theta \in[-2 \pi, 2 \pi]: 2 \cos ^{2} \theta+3 \sin \theta=0\right\}\) है, तो \(S\) के अवयवों का योगफल है :

  1. A \(\frac{{13\,\pi }}{6}\)
  2. B \(2\pi \)
  3. C \(\pi \)
  4. D \(\frac{{5\,\pi }}{3}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2\pi \)

Step-by-step Solution

Detailed explanation

\(2\,(1 - {\sin ^2}\theta )\, + \,3\,\sin \,\theta \, = \,0\) \( \Rightarrow {\kern 1pt} 2\,{\sin ^2}\theta \, - \,3\sin \,\theta \, - \,2\, = \,0\) \( \Rightarrow (2\,\sin \theta + 1)(\sin \theta - 2) = 0\)…
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