Mathematics · essential
Direction cosines of a line for JEE
Direction ratios and direction cosines and the angle between two intersecting lines
Formula
\(l=\cos\alpha,\ m=\cos\beta,\ n=\cos\gamma\)
Variables: \(\alpha,\beta,\gamma\) are the angles made by the line with positive \(x,y,z\)-axes respectively; \(l,m,n\) are direction cosines (d.c.s).
Finding orientation of a line, angle relations with axes.