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Direction cosines of three lines

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Direction cosines of three lines

Posted by Anish Borkotoky 6 years, 1 month ago

CBSE > Class 12 > Mathematics

1 answers

Shrawan Kashyap 6 years, 1 month ago

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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