$\tan ^{-1}\left(\frac{1}{3}\right)+\tan ^{-1}\left(\frac{1}{5}\right)+\tan ^{-1}\left(\frac{1}{7}\right)+\tan ^{-1}\left(\frac{1}{8}\right)$ का मान है

  • A
    $\frac{4 \pi}{3}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{2 \pi}{4}$
  • D
    $\frac{3 \pi}{4}$

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$\cot \left[\sum_{n=3}^{32} \cot ^{-1}\left(1+\sum_{k=1}^n 2 k\right)\right]=$

सिद्ध कीजिए कि $\sin ^{-1} \frac{8}{17}+\sin ^{-1} \frac{3}{5}=\tan ^{-1} \frac{77}{36}$

यदि $f(n) = \tan^{-1} \left( \frac{e-1}{e^{-n} + e^{n+1}} \right)$ सभी $n \in N$ के लिए है,तो $\sum_{n=1}^\infty f(n)$ का मान ज्ञात कीजिए।

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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