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$\cos A \cos 2 A \cos 4 A \ldots \cos 2^{n-1} A$ ની કિંમત શું થાય?

જો $\left(\frac{\sin 3 \theta}{\sin \theta}\right)^2-\left(\frac{\cos 3 \theta}{\cos \theta}\right)^2=a \cos b \theta$ હોય,તો $a: b=$

સાબિત કરો કે $\tan 4x = \frac{4 \tan x (1 - \tan^2 x)}{1 - 6 \tan^2 x + \tan^4 x}$.

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

જો $\sin \alpha = \frac{336}{625}$ અને $450^\circ < \alpha < 540^\circ$ હોય,તો $\sin \left( \frac{\alpha}{4} \right) = $

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