$\tan ^{-1}\left(\frac{\cos \left(\frac{15 \pi}{4}\right)-1}{\sin \left(\frac{\pi}{4}\right)}\right)$ का मान किसके बराबर है?

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

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