જો $x \neq -y$ અને $\sin x + \sin y = 3(\cos y - \cos x)$ હોય,તો $\tan(x - y) =$

  • A
    $\frac{\sqrt{3}}{2}$
  • B
    $-1$
  • C
    $\frac{3}{4}$
  • D
    $1$

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