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

यदि \(\cot ^{-1}(\alpha)=\cot ^{-1} 2+\cot ^{-1} 8+\cot ^{-1} 18\) \(+\cot ^{-1} 32+\ldots .100\) पदों तक, तो \(\alpha\) बराबर है

  1. A \(1.01\)
  2. B \(1.00\)
  3. C \(1.02\)
  4. D \(1.03\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(1.01\)

Step-by-step Solution

Detailed explanation

\(\operatorname{Cot}^{-1}(\alpha)=\cot ^{-1}(2)+\cot ^{-1}(8)+\cot ^{-1}(18)+\ldots .\) \(=\sum_{n=1}^{100} \tan ^{-1}\left(\frac{2}{4 n^{2}}\right)\) \(=\sum_{n=1}^{100} \tan ^{-1}\left(\frac{(2 n+1)-(2 n-1)}{1+(2 n+1)(2 n-1)}\right)\)…
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