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પદાવલિ $\cos^2(A - B) + \cos^2 B - 2\cos(A - B)\cos A\cos B$ એ

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જો $\cos \theta - \sin \theta = \sqrt{5} \sin \theta$ હોય,તો $\cos \theta + \sin \theta = $

$0 < \theta < \frac{\pi}{2}$ માટે નીચેનામાંથી કયું/કયા વિધાન સાચું/સાચા છે?

$\tan \frac{\pi}{5} + 2 \tan \frac{2 \pi}{5} + 4 \cot \frac{4 \pi}{5} = $

જો $\cos \theta + \sin \theta = \sqrt{2} \cos \theta$ અને $0 < \theta < \frac{\pi}{2}$ હોય,તો $\sec 2 \theta + \tan 2 \theta = $

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