Exercise 48

Suppose that a and b are nonzero vectors. (a) Under what circumstances is \(\text{comp}_\mathbf{a}\mathbf{b} = \text{comp}_\mathbf{b}\mathbf{a}\)? (b) Under what circumstances is \(\text{proj}_\mathbf{a}\mathbf{b} = \text{proj}_\mathbf{b}\mathbf{a}\)?