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જો $A, B, C, D$ એ ચક્રીય ચતુષ્કોણના ખૂણાઓ હોય,તો $\cos A + \cos B + \cos C + \cos D = $

$\cos \frac{2\pi}{15} \cos \frac{4\pi}{15} \cos \frac{8\pi}{15} \cos \frac{16\pi}{15} = $

$\sin 12^\circ \sin 24^\circ \sin 48^\circ \sin 84^\circ = $

જો $A + B = 225^\circ$ હોય,તો $\frac{\cot A}{1 + \cot A} \cdot \frac{\cot B}{1 + \cot B} = $

જો $x \sin \theta = y \sin \left( \theta + \frac{2\pi}{3} \right) = z \sin \left( \theta + \frac{4\pi}{3} \right)$ હોય,તો:

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