Vectors Question: Find all angles between each other. Please show all work

Question

1. Given (all letters are supposed to have arrows on the top/vectors) (Also the lines/double absolute signs are supposed to be beside each other not far away from each other) ||a|| = 8, ||b|| = 12, and ||a+b|| = 16, find all angles between each other

Answer 1

Hope this was helpful. There are other formulas for sin and cos which involve dot product and still others which involve the cross product. They require you to know the components of the vectors.