Question: In Problems 1922, v 1 = 4i + 6j, v 2 = 3i 6j, v 3 = 8i + 4j, and v 4 =

In Problems 19–22, v1 = 4i + 6j, v2 = −3i − 6j, v3 = −8i + 4j, and v4 = 10i + 15j.

Find the angle between the vectors v1 and v2.

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