यदि $\mathop {\lim }\limits_{x \to 0} kx\,\text{cosec}\,x = \mathop {\lim }\limits_{x \to 0} x\,\text{cosec}\,kx$ है,तो $k = $

  • A
    $1$
  • B
    $-1$
  • C
    $\pm 1$
  • D
    $\pm 2$

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