અમુક અચળાંકો $a$ અને $b$ માટે,$\frac{x-a}{x-b}$ નું વિકલન શોધો.

  • A
    $\frac{a-b}{(x-b)^{2}}$
  • B
    $\frac{b-a}{(x-b)^{2}}$
  • C
    $\frac{a+b}{(x-b)^{2}}$
  • D
    $\frac{a-b}{(x-a)^{2}}$

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