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JEE Mains · Maths · STD 11 - Trigonometrical equations

समीकरण \(\frac{\cos x }{1+\sin x }=|\tan 2 x |\), \(x \in\left(-\frac{\pi}{2}, \frac{\pi}{2}\right)-\left\{\frac{\pi}{4},-\frac{\pi}{4}\right\}\) के हलो का योग है

  1. A \(-\frac{11 \pi}{30}\)
  2. B \(\frac{\pi}{10}\)
  3. C \(-\frac{7 \pi}{30}\)
  4. D \(-\frac{\pi}{15}\)
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Answer & Solution

Correct Answer

(A) \(-\frac{11 \pi}{30}\)

Step-by-step Solution

Detailed explanation

\(\frac{\cos x}{1+\sin x}=|\tan 2 x|\) \(\Rightarrow \frac{\cos ^{2} x / 2-\sin ^{2} x / 2}{(\cos x / 2+\sin x / 2)}=|\tan 2 x|\) \(\Rightarrow \tan ^{2}\left(\frac{\pi}{4}-\frac{x}{2}\right)=\tan ^{2} 2 x\) \(\Rightarrow 2 x=n \pi \pm\left(\frac{\pi}{4}-\frac{x}{2}\right)\)…
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