જો $\int {\frac{{{x^2} - x + 1}}{{{x^2} + 1}}{e^{{{\cot }^{ - 1}}x}}dx = A(x) {e^{{{\cot }^{ - 1}}x}} + C}$ હોય,તો $A(x)$ ની કિંમત શોધો.

  • A
    $-x$
  • B
    $x$
  • C
    $\sqrt {1-x}$
  • D
    $\sqrt {1+x}$

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