$\mathop {Limit}\limits_{x \to \frac{\pi }{2}} \,\frac{{\sin x}}{{{{\cos }^{ - 1}}\left[ {\frac{1}{4}\,(3\sin x\, - \,\sin 3x)} \right]}}\,$,जहाँ $[ \cdot ]$ महत्तम पूर्णांक फलन को दर्शाता है,का मान है

  • A
    $\frac{2}{\pi }$
  • B
    $1$
  • C
    $\frac{4}{\pi }$
  • D
    अस्तित्व में नहीं है

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