$$\sqrt{2+\sqrt{2+\sqrt{2+2 \cos 8 \theta}}}=$$

The value of $$\cos 1200^{\circ}+\tan 1485^{\circ}$$ is

The value of $$\tan 1^{\circ} \tan 2^{\circ} \tan 3^{\circ} \ldots \tan 89^{\circ}$$ is

The value of $$\sin ^2 51^{\circ}+\sin ^2 39^{\circ}$$ is