Show that there are at least two ways to calculate the angle formed by the vectors

[cos 19, sin 19] and [cos 54, sin 54].

2 answers

please guys I need help I am stuck on this problem
the two points lie on the unit circle, clearly 54-19 degrees apart. The angle is 35°.

or, use the distance formula to find the vector u-v.

Then use the law of cosines to find the included angle.