$\cos ^{-1}\left\{\frac{1}{\sqrt{2}}\left(\cos \frac{9 \pi}{10}-\sin \frac{9 \pi}{10}\right)\right\}$ का मान ज्ञात कीजिए।

  • A
    $\frac{7 \pi}{20}$
  • B
    $\frac{13 \pi}{20}$
  • C
    $\frac{17 \pi}{20}$
  • D
    $\frac{21 \pi}{20}$

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