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यदि $\cos A = \frac{7}{25}$ और $\frac{3 \pi}{2} < A < 2 \pi$ है,तो $\cos \frac{A}{4} + \cos \frac{A}{2} - \cos 2A =$

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

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

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

$\sqrt{2+\sqrt{2+2 \cos 4 \theta}} = $

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