જો $\lim _{x \rightarrow 0} \frac{\cos 2x - \cos 4x}{1 - \cos 2x} = k$,હોય તો $\lim _{x \rightarrow k} \frac{x^k - 27}{x^{k+1} - 81} = $

  • A
    $0$
  • B
    $1$
  • C
    $\frac{1}{2}$
  • D
    $\frac{1}{4}$

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$\mathop {\lim }\limits_{n \to \infty } {({4^n} + {5^n})^{1/n}}$ ની કિંમત શોધો.

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