The vector v=⟨6,−8⟩\mathbf{v} = \langle 6, -8 \ranglev=⟨6,−8⟩ makes what angle with the positive xxx-axis? (Use tan−1\tan^{-1}tan−1)
≈53.1°\approx 53.1°≈53.1° below xxx-axis
≈36.9°\approx 36.9°≈36.9° below xxx-axis
≈53.1°\approx 53.1°≈53.1° above xxx-axis
≈126.9°\approx 126.9°≈126.9° (in 2nd quadrant)