यदि $0 \leq x \leq 2 \pi$ है,तो $x$ के वास्तविक मानों की संख्या जो समीकरण $\sin x + \sin 2x + \sin 3x + \sin 4x = 0$ को संतुष्ट करते हैं,है

  • A
    $9$
  • B
    $7$
  • C
    $3$
  • D
    $5$

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