यदि $\lim _{x \rightarrow 0} \frac{ae^{x}-b \cos x + ce^{-x}}{x \sin x} = 2$ है,तो $a + b + c$ का मान ........... है।

  • A
    $2$
  • B
    $5$
  • C
    $6$
  • D
    $4$

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