$\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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$\lim _{x \rightarrow \frac{\pi}{4}} \frac{4 \sqrt{2}-(\cos x+\sin x)^5}{1-\sin 2 x} = $

यदि $f(x)$ एक अवकलनीय फलन है और $f''(0) = a$ है,तो $\mathop {\lim }\limits_{x \to 0} \frac{2f(x) - 3f(2x) + f(4x)}{x^2}$ का मान क्या है ($a$ में)?

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