Q. 29

Find the direction cosines of a vector which is equally inclined to the x - axis, y - axis and z - axis.

Answer :

Let the inclination with:

x - axis =

y - axis =

z - axis =

The vector is equally inclined to the three axes.

Direction cosines

We know that:cos2 α + cos2 β + cos2 γ = 1

cos2 α + cos2 α + cos2 α = 1 …(

3 cos2 α = 1


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