Group Example: Direction Cosines

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I said they were magic. I love direction cosines. If I ever know even one of the angles to an axis, it will greatly simplify a problem. Just be careful. It is from the vector to an axis, NOT from the vector to a plane.
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i d ont know if u see this but why is the f1 x component sin and not cosine for 4:28

kingsleyekechukwu