Question
If a line has direction ratios 2, -1, -2, determine its
direction cosines.Solution
Directions cosines are: => 2/[√(22 + (-1)2 + (-2)2)], -1/[√(22 + (-1)2 + (-2)2)], -2/[√(22 + (-1)2 + (-2)2)] => 2/3, -1/3, -2/3
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