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} = $

  • A
    $1$
  • B
    $2$
  • C
    $0$
  • D
    $3$

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$(\sin 210^{\circ})(\sin 585^{\circ})$ का मान क्या है?

$\cos 1^\circ + \cos 2^\circ + \cos 3^\circ + \dots + \cos 180^\circ = $

$\cot (45^\circ + \theta ) \cot (45^\circ - \theta ) = $

$\sin^{2} 51^{\circ} + \sin^{2} 39^{\circ}$ का मान है

$\cos 18^{\circ} = $

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