यदि $[x]$ महत्तम पूर्णांक फलन को दर्शाता है और $f(x) = x - [x] - \cos x$ है,तो $f^{\prime}\left(\frac{\pi}{2}\right) = $

  • A
    $1$
  • B
    अस्तित्व में नहीं है
  • C
    $0$
  • D
    $2$

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