${\tan ^{ - 1}}\left( {\frac{{\sqrt {1 + {x^2}} - 1}}{x}} \right)$ નું ${\tan ^{ - 1}}x$ ની સાપેક્ષે વિકલન ગુણાંક શોધો.

  • A
    $1/2$
  • B
    $-1/2$
  • C
    $1$
  • D
    આમાંથી કોઈ નહીં

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