$\tan^{-1} \left( \frac{\cos(\frac{19\pi}{4}) - 1}{\sin(\frac{\pi}{4})} \right)$ का मान किसके बराबर है?

  • A
    $-\frac{\pi}{4}$
  • B
    $-\frac{5\pi}{12}$
  • C
    $-\frac{3\pi}{8}$
  • D
    $-\frac{4\pi}{9}$

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