The value of $\tan^{-1} \left( \frac{\sin 2 - 1}{\cos 2} \right)$ is equal to:

  • A
    $\frac{\pi}{2} - 1$
  • B
    $2 - \frac{\pi}{2}$
  • C
    $1 - \frac{\pi}{4}$
  • D
    $\frac{\pi}{4} - 1$

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