$\cos ^{-1}\left(\tan \left(\frac{7 \pi}{4}\right)\right)$ નું મૂલ્ય શું છે?

  • A
    $\frac{\pi}{4}$
  • B
    $\frac{\pi}{2}$
  • C
    $\pi$
  • D
    $\frac{2 \pi}{3}$

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