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JEE Mains · Maths · STD 11 - Trigonometrical equations

माना \(S =\left\{\theta \in[-\pi, \pi]-\left\{\pm \frac{\pi}{2}\right\}: \sin \theta \tan \theta+\tan \theta=\sin 2 \theta\right\}\) है। यदि \(T =\sum_{\theta \in S } \cos 2 \theta\) है, तो \(T + n ( S )\) बराबर है

  1. A \(7+\sqrt{3}\)
  2. B \(9\)
  3. C \(8+\sqrt{3}\)
  4. D \(10\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(9\)

Step-by-step Solution

Detailed explanation

\(\sin \theta \tan \theta+\tan \theta=\sin 2 \theta\) \(\tan \theta(\sin \theta+1)=\frac{2 \tan \theta}{1+\tan ^{2} \theta}\) \(\tan \theta=0 \Rightarrow \theta=-\pi, 0, \pi\) \((\sin \theta+1)=2 \cdot \cos ^{2} \theta=2(1+\sin \theta)(1-\sin \theta)\) \(\sin \theta=-1\) which…
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