cos(2+u)=0.4161, u=????
$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}^{\!\!\mathtt{-1}}{\left({\mathtt{0.416\: \!1}}\right)} = {\mathtt{65.411\: \!392\: \!158\: \!751^{\circ}}}$$
now is u in radians or in degrees?