यदि $2 \cos \theta = x + \frac{1}{x}$ है,तो $2 \cos 3 \theta = $

  • A
    $x^3 - \frac{1}{x^3}$
  • B
    $\left(x + \frac{1}{x}\right)^3$
  • C
    $x + \frac{1}{x}$
  • D
    $x^3 + \frac{1}{x^3}$

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Similar Questions

$\cos A \cos 2 A \cos 4 A \ldots \cos 2^{n-1} A$ का मान क्या है?

$\cos(60^{\circ} - A) \cdot \cos A \cdot \cos(60^{\circ} + A)$ का मान है

सिद्ध कीजिए कि $\cos^{2} 2x - \cos^{2} 6x = \sin 4x \sin 8x$.

$\frac{\sin 3\theta - \cos 3\theta}{\sin \theta + \cos \theta} + 1 = $

यदि $\cos A = \frac{\sqrt{3}}{2}$ है,तो $\tan 3A = $

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