यदि $\sum_{n=1}^{2026} \tan^{-1}(\frac{1}{n^2+n+1}) = \tan^{-1}(1 - \frac{1}{x})$, जहाँ $x \neq 0$, तो $x = $

  • A
    $2028$
  • B
    $2026$
  • C
    $1014$
  • D
    $1013$

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$2{\tan ^{ - 1}}\left( {\frac{1}{3}} \right) + {\tan ^{ - 1}}\left( {\frac{1}{7}} \right) = $

व्यंजक $ \tan \left(\frac{1}{2} \cos ^{-1} \frac{2}{\sqrt{5}}\right) $ का मान है

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यदि $|x|>1$ के लिए, $\tanh ^{-1}\left(\frac{1}{x}\right)+\operatorname{coth}^{-1}(x)=\log _e(f(x))$ है, तो $f(-5)=$

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