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$4 \cos \frac{\pi}{7} \cos \frac{\pi}{5} \cos \frac{2 \pi}{7} \cos \frac{2 \pi}{5} \cos \frac{4 \pi}{7} = $

પદાવલિ $2 \cos \frac{\pi}{13} \cos \frac{9\pi}{13} + \cos \frac{3\pi}{13} + \cos \frac{5\pi}{13}$ ની કિંમત શું થાય?

$(\sec A + \tan A - 1)(\sec A - \tan A + 1) - 2\tan A = $

જો $x \sin^3 \alpha + y \cos^3 \alpha = \sin \alpha \cos \alpha$ અને $x \sin \alpha - y \cos \alpha = 0$ હોય,તો $x^2 + y^2 = $

શ્રેણી $\sum_{n=1}^{\infty} \sin \left(\frac{n! \pi}{720}\right)$ નો સરવાળો શું થાય?

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