यदि $x \sin \theta = y \sin \left( \theta + \frac{2\pi}{3} \right) = z \sin \left( \theta + \frac{4\pi}{3} \right)$ है,तो:

  • A
    $x + y + z = 0$
  • B
    $xy + yz + zx = 0$
  • C
    $xyz + x + y + z = 1$
  • D
    इनमें से कोई नहीं

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यदि $\sin (\theta + \alpha ) = a$ और $\sin (\theta + \beta ) = b$ है,तो $\cos 2(\alpha - \beta ) - 4ab\cos (\alpha - \beta )$ का मान ज्ञात कीजिए।

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