कुछ $a, b, c \in R$ के लिए,यदि $\sin 5 \theta = a \cos^4 \theta \sin \theta + b \cos^2 \theta \sin^3 \theta + c \sin^5 \theta$ है,तो $abc =$

  • A
    -$10$
  • B
    $10$
  • C
    $0$
  • D
    -$50$

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