How to calculate direction cosines when 2 coordinates are given?
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The direction cosines of a line parallel to any coordinate axis are equal to the direction cosines of the corresponding axis. The dc's are associated by the relation l2 + m2 + n2 =1. If the given line is reversed, then the direction cosines will be cos (π − α), cos (π − β), cos (π − γ) or − cos α, − cos β, − cos γ.
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