Calculus 12.5 Equations of Lines and Planes

My notes are available at asherbroberts.com/ (so you can write along with me).
Calculus: Early Transcendentals 8th Edition by James Stewart

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굉장하다 Asher Roberts

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In example 7, I think you find the angle between the normal lines instead of planes

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The angle between planes is defined to be the angle between their normal vectors, as mentioned in the definition preceding Example 7.