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Unit Vector
The unit vector of A is defined as As in the twodimensional case, the components of U, shown in Figure 10.3.5, are the direction cosines of A, U = cos αi + cos βj + cos γk. Figure 10.3.5(a) & (b)
Again, A is determined by its length and direction cosines, and the sum of the squares of the direction cosines is one, A = A cos αi + A cos βj + A cos γk, cos^{2} α + cos^{2} β + cos^{2} γ = 1.


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