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$\cos 36^{\circ} - \cos 72^{\circ}$ का मान ज्ञात कीजिए।

$\cos 18^{\circ} = $

यदि $x \sin 45^\circ \cos^2 60^\circ = \frac{\tan^2 60^\circ \csc 30^\circ}{\sec 45^\circ \cot^2 30^\circ}$ है,तो $x = $

यदि $\theta = \frac{17 \pi}{3}$ है,तो $(\tan \theta - \cot \theta) = \dots$

यदि $\tan \theta = \frac{20}{21}$ है,तो $\cos \theta$ का मान क्या होगा?

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