$\frac{\cot A}{1-\tan A}+\frac{\tan A}{1-\cot A} = ?$

  • A
    $1+\tan A+\cot A$
  • B
    $1+\sec A \operatorname{cosec} A$
  • C
    $\sin A \cos A+1$
  • D
    $\sec A \operatorname{cosec} A-1$

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