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

$\frac{\cot 54^{\circ}}{\tan 36^{\circ}} + \frac{\tan 20^{\circ}}{\cot 70^{\circ}}$ का मान है

निम्नलिखित डिग्री माप के संगत रेडियन माप ज्ञात कीजिए: $25^{\circ}$

सिद्ध कीजिए कि $2 \sin ^{2} \frac{3 \pi}{4} + 2 \cos ^{2} \frac{\pi}{4} + 2 \sec ^{2} \frac{\pi}{3} = 10$.

यदि $y = \log_e \tan \left(\frac{\pi}{4} + \frac{x}{2}\right)$ है,तो $\tanh \left(\frac{y}{2}\right) = $

$\cos ^2 45^{\circ}+\cos ^2 135^{\circ}+\cos ^2 225^{\circ}+\cos ^2 315^{\circ} = $

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