tan 400t = 2 400t = 1.1 how? I've been struggling with this for an hour.

oh wow completely forgot that it might be in rad. 
Thanks you just saved my mind from blowing up!

Do arctan(2) in rad - modus. You get $$1.10714871779\ rad$$

Do arctan(2) in degree - modus. You get $$63.4349488229\ensurement{^{\circ}}$$

$$\\ 63.4349488229\ensurement{^{\circ}} \cdot \frac{\pi}{180} = 1.10714871779\ rad \\\\ 1.10714871779\ rad \cdot \frac{180}{\pi} =63.4349488229\ensurement{^{\circ}} \\$$

WOW heureka, you just saved us a grey cell explosing. 

This is excellent as they are known to be quite messy!