Given u=⟨5,12⟩\mathbf{u} = \langle 5, 12 \rangleu=⟨5,12⟩, what is the unit vector in the direction opposite to u\mathbf{u}u?
⟨513,1213⟩\langle \frac{5}{13}, \frac{12}{13} \rangle⟨135,1312⟩
⟨−513,−1213⟩\langle -\frac{5}{13}, -\frac{12}{13} \rangle⟨−135,−1312⟩
⟨−5,−12⟩\langle -5, -12 \rangle⟨−5,−12⟩
⟨1213,−513⟩\langle \frac{12}{13}, -\frac{5}{13} \rangle⟨1312,−135⟩