$\mathop {\lim }\limits_{x \to \pi /2} \frac{2x - \pi}{\cos x} = $

  • A
    $2$
  • B
    $1$
  • C
    $-2$
  • D
    इनमें से कोई नहीं

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जब $x \rightarrow 0$ हो,तो $\left\{\frac{1}{x} \sqrt{1+x}-\sqrt{1+\frac{1}{x^{2}}}\right\}$ की सीमा है:

सीमा का मान ज्ञात कीजिए: $\mathop {\text{Limit}}\limits_{x \to 4} \frac{(\cos \alpha)^x - (\sin \alpha)^x - \cos 2\alpha}{x - 4}$,जहाँ $0 < \alpha < \frac{\pi}{2}$.

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