यदि $\int \sqrt{\frac{x-7}{x-9}} ~dx = A \sqrt{x^2-16x+63} + \log \left|(x-8)+\sqrt{x^2-16x+63}\right| + c,$ (जहाँ $c$ समाकलन का एक स्थिरांक है) तो $A$ का मान है

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

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