यदि $0 \leq x \leq \frac{\pi}{2}$ है, तो $x$ के उन मानों की संख्या जिनके लिए $\sin x - \sin 2x + \sin 3x = 0$ है, होगी

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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