$\lim _{x \rightarrow 0}\left(\frac{1+\tan x}{1+\sin x}\right)^{\operatorname{cosec} x}=$

  • A
    $0$
  • B
    $1$
  • C
    $e$
  • D
    $\frac{1}{e}$

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$\lim _{x \rightarrow 0} \frac{9^x-4^x}{x(9^x+4^x)} = $

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$\lim _{x \rightarrow 1} \frac{(2 x-3)(\sqrt{x}-1)}{2 x^2+x-3}$

यदि $f(x) = \cos x$ जब $x = n\pi$ $(n = 0, 1, 2, 3, \dots)$ और अन्यथा $f(x) = 3$,तथा $\phi(x) = \begin{cases} x^2 + 1 & \text{जब } x \neq 3, x \neq 0 \\ 3 & \text{जब } x = 0 \\ 5 & \text{जब } x = 3 \end{cases}$ है,तो $\lim_{x \to 0} f(\phi(x))$ ज्ञात कीजिए।

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