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$\cot (45^\circ + \theta ) \cot (45^\circ - \theta ) = $

પદાવલિ $\tan(x - 9\pi)$ ની કિંમત કોના બરાબર છે:

$\frac{1}{\cos 290^{\circ}}+\frac{1}{\sqrt{3} \sin 250^{\circ}} = $

$\sin 15^\circ + \cos 105^\circ = $

સાબિત કરો કે $\frac{\cos (\pi+x) \cos (-x)}{\sin (\pi-x) \cos (\frac{\pi}{2}+x)} = \cot^{2} x$.

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