Test my Merit My Results Create Exam

Three Dimensional Geometry | Direction ratios and Direction cosines

If a line makes a angles α, β and γ with the coordinate axes, then
The three steps from solids to points are:
lf a line makes angles α, β, γ with OX, OY, OZ respectively where O = (0, 0, 0), then cos2α + cos2β + cos2γ is
If a line makes the angles α, β, γ with the axes, then what is the value of (1 + cos 2α + cos 2β + cos 2γ) equal to?  
Ads