$\frac{2}{\sqrt{2+\sqrt{2+\sqrt{2+2 \cos 4x}}}}$ का सरलतम रूप है

  • A
    $\sec \frac{x}{2}$
  • B
    $\sec x$
  • C
    $\operatorname{cosec} x$
  • D
    $1$

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यदि $\cos x = -\frac{1}{3}$ और $x$ चतुर्थांश $III$ में स्थित है,तो $\sin \frac{x}{2}, \cos \frac{x}{2}$ और $\tan \frac{x}{2}$ का मान ज्ञात कीजिए।

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$\tan 20^\circ \tan 40^\circ \tan 60^\circ \tan 80^\circ = $

मान ज्ञात कीजिए: $\sin(22 \frac{1}{2}^{\circ})$

यदि $\frac{2\sin \alpha}{1 + \cos \alpha + \sin \alpha} = y$ है,तो $\frac{1 - \cos \alpha + \sin \alpha}{1 + \sin \alpha} = $

सिद्ध कीजिए कि $\sin 2x + 2 \sin 4x + \sin 6x = 4 \cos^2 x \sin 4x$.

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