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$\cos \left(\frac{2 \pi}{7}\right) + \cos \left(\frac{4 \pi}{7}\right) + \cos \left(\frac{6 \pi}{7}\right)$ ની કિંમત શોધો.

જો $\theta = 3\alpha$ અને $\sin \theta = \frac{a}{\sqrt{a^2 + b^2}}$ હોય,તો $a \csc \alpha - b \sec \alpha$ પદાવલિનું મૂલ્ય શું થાય?

$cot 5^o - tan 5^o - 2 tan 10^o - 4 tan 20^o - 8 cot 40^o$ ની કિંમત શોધો.

$\left( \frac{\sin 2A}{1 + \cos 2A} \right) \left( \frac{\cos A}{1 + \cos A} \right) = $

જો $\sin \theta = \frac{3}{5}$ અને $\theta$ પ્રથમ ચરણમાં નથી,તો $15 \sin 2 \theta - 20 \cos 2 \theta - 7 \tan 2 \theta = $

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