Asked by Anonymous

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].
Answered by Anonymous
please guys I need help I am stuck on this problem
Answered by Steve
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.
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