Answer
$1$
Work Step by Step
$\tan{(\theta+180^{\circ}k ) } = \tan{\theta}$
$\therefore \tan{(405^{\circ})} = \tan{(45^{\circ}+ 2 \times 180^{\circ})} = \tan{45^{\circ}}$
$\tan{45^{\circ}}= \boxed{1}$
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