$x=2$ આગળ $\frac{2x}{1+x^2}$ ની સાપેક્ષે $\frac{1-x^2}{1+x^2}$ નું વિકલન શું થાય?

  • A
    $0$
  • B
    $\frac{4}{3}$
  • C
    $1$
  • D
    $-\frac{4}{3}$

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