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JEE Mains · Maths · STD 12 - 2. inverse trigonometric function

यदि \(n \in N\) हो, और \(\cot ^{-1} 3+\cot ^{-1} 4+\cot ^{-1} 5+\cot ^1 n=\frac{\pi}{4}\), तो \(\mathrm{n}\) = ...........

  1. A \(70\)
  2. B \(56\)
  3. C \(10\)
  4. D \(47\)
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Correct Answer

(D) \(47\)

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Detailed explanation

\( \cot ^{-1} 3+\cot ^{-1} 4+\cot ^{-1} 5+\cot ^1 n=\frac{\pi}{4} \) \( \tan ^{-1} \frac{1}{3}+\tan ^{-1} \frac{1}{4}+\tan ^{-1} \frac{1}{5}+\tan ^{-1} \frac{1}{n}=\frac{\pi}{4} \) \( \tan ^{-1}\left(\frac{46}{48}\right)+\tan ^{-1} \frac{1}{n}=\frac{\pi}{4} \)…
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