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જો $\frac{\cos x}{a} = \frac{\cos (x + \theta)}{b} = \frac{\cos (x + 2\theta)}{c} = \frac{\cos (x + 3\theta)}{d}$ હોય,તો $\left( \frac{a + c}{b + d} \right)$ ની કિંમત શોધો:

જો $\cos A = m \cos B$ હોય,તો

જો $\sinh x = -\frac{4}{3}$ હોય,તો $\sinh 2x + \cosh 2x = $

$\cos(18^{\circ}-A) \cdot \cos(18^{\circ}+A) - \cos(72^{\circ}-A) \cdot \cos(72^{\circ}+A)$ ની કિંમત શોધો.

$2(\sin^6 \theta + \cos^6 \theta) - 3(\sin^4 \theta + \cos^4 \theta) + 1$ ની કિંમત શોધો.

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