The number of solutions of the equation $\sin \theta+\cos \theta=\sin 2 \theta$ in the interval $[-\pi, \pi]$ is

  • [KVPY 2017]
  • A

    $1$

  • B

    $2$

  • C

    $3$

  • D

    $4$

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  • [JEE MAIN 2024]