यदि $x = y \cos \frac{2\pi}{3} = z \cos \frac{4\pi}{3}$ है,तो $xy + yz + zx = $

  • A
    $-1$
  • B
    $0$
  • C
    $1$
  • D
    $2$

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Similar Questions

यदि $\tan \theta + \cot \theta = 2$ और $0^{\circ} < \theta < 90^{\circ}$ है,तो $\theta$ का मान $(\text{in } ^{\circ})$ क्या होगा?

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यदि $x \cos \theta = y \cos \left( \theta + \frac{2\pi}{3} \right) = z \cos \left( \theta + \frac{4\pi}{3} \right)$ है,तो $\frac{1}{x} + \frac{1}{y} + \frac{1}{z}$ का मान क्या होगा?

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यदि $\alpha, \beta, \gamma \in \left( 0, \frac{\pi}{2} \right)$ है,तो $\frac{\sin(\alpha + \beta + \gamma)}{\sin \alpha + \sin \beta + \sin \gamma}$ का मान क्या है?

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