यदि $y = \sin x \cdot \sin 2x \cdot \sin 3x \cdot \ldots \cdot \sin nx$ है,तो $y^{\prime}$ है

  • A
    $\sum_{k=1}^{n} k \tan kx$
  • B
    $y \cdot \sum_{k=1}^{n} k \cot kx$
  • C
    $y \cdot \sum_{k=1}^{n} k \tan kn$
  • D
    $\sum_{k=1}^{n} \cot kx$

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