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JEE Mains · Maths · STD 11 - Trigonometrical equations

यदि समीकरण निकाय \(2 \sin ^2 \theta-\cos 2 \theta=0\) तथा \(2 \cos ^2 \theta+3 \sin \theta=0\) के अंतराल \([0,2 \pi]\) में हलों का योगफल \(k \pi\) है, तो \(k\) बराबर है \(......\)

  1. A \(3\)
  2. B \(6\)
  3. C \(9\)
  4. D \(12\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(3\)

Step-by-step Solution

Detailed explanation

\(2 \sin ^{2} \theta-\cos 2 \theta=0\) \(2 \sin ^{2} \theta-\left(1-2 \sin ^{2} \theta\right)=0\) \(\sin ^{2} \theta=\left(\frac{1}{2}\right)^{2}\) \(\theta=\frac{\pi}{6}, \frac{5 \pi}{6}, \frac{7 \pi}{6}, \frac{11 \pi}{6}\) \(2 \cos ^{2} \theta+3 \sin \theta=0\)…
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