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જો $P = \tan 15^{\circ} + \cot 15^{\circ}$,$Q = \tan 22 \frac{1}{2}^{\circ} + \cot 22 \frac{1}{2}^{\circ}$ અને $R = \sin 54^{\circ} + \sin 18^{\circ}$ હોય,તો તેમનો ચડતો ક્રમ કયો છે?

જો $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ હોય,તો $\cos ^2 48^{\circ} - \sin ^2 12^{\circ}$ ની કિંમત શોધો.

ધારો કે $A$ અને $B$ વિધાનો દર્શાવે છે:
$A: \cos \alpha + \cos \beta + \cos \gamma = 0$
$B: \sin \alpha + \sin \beta + \sin \gamma = 0$
જો $\cos (\alpha - \beta) + \cos (\beta - \gamma) + \cos (\gamma - \alpha) = -\frac{3}{2}$ હોય,તો:

જો $\frac{\cos (\theta_1+\theta_2)}{\cos (\theta_1-\theta_2)}+\frac{\cos (\theta_3-\theta_4)}{\cos (\theta_3+\theta_4)}=0$ હોય,તો $\cot \theta_1 \cdot \cot \theta_2 \cdot \cot \theta_3 \cdot \cot \theta_4=$

જો $u = \log \tan \left(\frac{\pi}{4} + \frac{\theta}{2}\right)$ હોય,તો $\cosh u =$

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