यदि $\cos \theta = \frac{1}{2}\left( x + \frac{1}{x} \right)$ है,तो $\frac{1}{2}\left( x^2 + \frac{1}{x^2} \right) = $

  • A
    $\sin 2\theta $
  • B
    $\cos 2\theta $
  • C
    $\tan 2\theta $
  • D
    $\sec 2\theta $

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$\cos y \cos \left( \frac{\pi}{2} - x \right) - \cos \left( \frac{\pi}{2} - y \right) \cos x + \sin y \cos \left( \frac{\pi}{2} - x \right) + \cos x \sin \left( \frac{\pi}{2} - y \right)$ का मान शून्य है,यदि

$\sin^4 \frac{\pi}{8} + \sin^4 \frac{3\pi}{8} + \sin^4 \frac{5\pi}{8} + \sin^4 \frac{7\pi}{8} = $

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$(\sec 2A + 1){\sec ^2}A = $

$\tan 3A - \tan 2A - \tan A = $

$(\cos \alpha + \cos \beta )^2 + (\sin \alpha + \sin \beta )^2 = $

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