$\mathop {\lim }\limits_{\alpha \to \pi /4} \frac{{\sin \alpha - \cos \alpha }}{{\alpha - \frac{\pi }{4}}} = $

  • A
    $\sqrt{2}$
  • B
    $1/\sqrt{2}$
  • C
    $1$
  • D
    इनमें से कोई नहीं

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