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જો $x + \frac{1}{x} = 2 \cos \theta$ હોય,તો $x^3 + \frac{1}{x^3} = $

જો $\cos \theta = \frac{1}{2}\left( a + \frac{1}{a} \right)$ હોય,તો $\cos 3\theta$ ની કિંમત શોધો.

$(4 \cos^2 9^{\circ} - 3)(4 \cos^2 27^{\circ} - 3) = $

જો $\theta$ કોઈ ખૂણો હોય,તો $\sin^2 \theta \cos^2 \theta =$

જો $\sin x - \sin y = \frac{1}{2}$ અને $\cos x - \cos y = 1$ હોય,તો $\tan(x + y)$ ની કિંમત શોધો.

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