$x > 0$ के लिए, यदि $\sin(\cos^{-1} x + \tan^{-1} x) - \cos(\sin^{-1} x + \tan^{-1} x) = \sin(\cot^{-1} 2)$ है, तो $x =$ का मान क्या है?

  • A
    $\frac{1}{\sqrt{2}}$
  • B
    $\frac{1}{2}$
  • C
    $\frac{\sqrt{3}}{2}$
  • D
    $1$

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मान लीजिए $S_{n} = \cot^{-1} 2 + \cot^{-1} 8 + \cot^{-1} 18 + \cot^{-1} 32 + \dots$ $n$ वें पद तक है। तो $\lim_{n \rightarrow \infty} S_{n}$ है

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