$x \in R$ માટે $\tan ^{-1} x$ નું $\cot ^{-1} x$ ની સાપેક્ષમાં વિકલન કરો.

  • A
    $1$
  • B
    $\frac{1}{1+x^2}$
  • C
    $-1$
  • D
    $\frac{-1}{1+x^2}$

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