$\lim _{x \rightarrow 0^{-}} \frac{\sqrt{\frac{1}{2}(1-\cos ^2 x)}}{x}$ का मान ज्ञात कीजिए।

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

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