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यदि $\cos 40^\circ = x$ और $\cos \theta = 1 - 2x^2$ है,तो $0^\circ$ और $360^\circ$ के बीच $\theta$ के संभावित मान क्या हैं?

यदि $90^{\circ} < A < 180^{\circ}$ और $\sin A = \frac{4}{5}$ है,तो $\tan \frac{A}{2} =$

यदि $A = 133^\circ$ है,तो $2\cos \frac{A}{2}$ किसके बराबर है?

$\frac{\sec 8A - 1}{\sec 4A - 1} = $

$\cos \frac{\pi}{2^2} \cdot \cos \frac{\pi}{2^3} \cdot \cos \frac{\pi}{2^4} \cdots \cos \frac{\pi}{2^{10}} = $

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