જો $\tan A - \tan B = x$ અને $\cot A - \cot B = y$ હોય,તો $\cot (A - B) =$

  • A
    $\frac{xy}{x+y}$
  • B
    $\frac{xy}{x-y}$
  • C
    $\frac{x-y}{xy}$
  • D
    $\frac{y-x}{xy}$

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