यदि $\sin x + \sin y = 3(\cos y - \cos x)$ है,तो $\frac{\sin 3x}{\sin 3y}$ का मान क्या है?

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    इनमें से कोई नहीं

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निम्नलिखित में से कौन सा सही है?

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