cos shift 7/6
acos (7/60)
$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}^{\!\!\mathtt{-1}}{\left({\frac{{\mathtt{7}}}{{\mathtt{60}}}}\right)} = {\mathtt{83.300\: \!234\: \!822\: \!24^{\circ}}}$$
