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10-90.

Find the angle between each pair of vectors below.

1. $\langle - 6,3 \rangle$ and $\langle 2,4 \rangle$

$-6·2+3·4$

1. $3 \mathbf{\text{i}} + 4 \mathbf{\text{j}}$ and $-2\mathbf{\text{j}}$

These vectors are $⟨3, 4⟩$ and $⟨0, −2⟩$.