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  3. 3 let be the angles made by...

Question: 3 let be the angles made by...

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3. Let α, β, γ be the angles made by a vector (or a line) with positive x, y, and z axis respectively. Then the numbers 1-cos a, m=cos β, n=cos γ are called the direction cosines of the the vector (or the line) (a) Find the direction cosines I, m, n of the vector u (1,2,3) (b) Find the direction cosines l, m, n of the vector u = (a,b,c).

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