यदि $\cot ^{-1}(7)+\cot ^{-1}(8)+\cot ^{-1}(18)=\cot ^{-1} x$ है,तो $x$ का मान ज्ञात कीजिए।

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

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$\cot ^{-1}\left(2 \cdot 1^2\right)+\cot ^{-1}\left(2 \cdot 2^2\right)+\cot ^{-1}\left(2 \cdot 3^2\right)+\ldots \ldots \ldots \infty =$

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