$\mathop {\lim }\limits_{x \to 1} \frac{{{x^2} - 1}}{{{{\sin }^2}x + \cos x \cos (x + 2) - {{\cos }^2}(x + 1)}}$ का मान है:

  • A
    $0$
  • B
    $\frac{1}{\cos 1}$
  • C
    $\frac{2}{\sin 2}$
  • D
    $\frac{1}{2 \cos 1}$

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