જો $\lim _{x \rightarrow 0} \frac{\left(e^{k x}-1\right) \sin k x}{x^{2}}=4$ હોય,તો $k$ ની કિંમત શોધો.

  • A
    $2$
  • B
    $-2$
  • C
    $\pm 2$
  • D
    $\pm 4$

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