Mathematics · important
Direction ratios from direction cosines for JEE
Direction ratios and direction cosines and the angle between two intersecting lines
Formula
\(a:b:c=l:m:n\)
Variables: \((a,b,c)\) are direction ratios; \((l,m,n)\) are direction cosines.
Conditions: Any nonzero proportional triple may be taken as d.r.s.
Obtaining line equation from orientation information.