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JEE Mains · Maths · STD 11 - Trigonometrical equations

यदि समीकरण \(\log _{\cos x} \cot x+4 \log _{\sin x} \tan x=1, x \in\left(0, \frac{\pi}{2}\right)\) का हल \(\sin ^{-1}\left(\frac{\alpha+\sqrt{\beta}}{2}\right)\) हैं, जहाँ, \(\alpha, \beta\) पूर्णांक है, तो \(\alpha+\beta\) बराबर है :

  1. A \(3\)
  2. B \(5\)
  3. C \(6\)
  4. D \(4\)
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Answer & Solution

Correct Answer

(D) \(4\)

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Detailed explanation

\(\log _{\cos x} \cot x+4 \log _{\sin x} \tan x=1\) \(\Rightarrow \frac{\ln \cos x-\ln \sin x}{\ln \cos x}+4 \frac{\ln \sin x-\ln \cos x}{\ln \sin x}=1\) \(\Rightarrow(\ln \sin x)^2-4(\ln \sin x)(\ln \cos x)+4(\ln \cos x)^2=1\) \(\Rightarrow \ln \sin x=2 \ln \cos x\)…
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