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If a line has direction ratios 2, -1, -2 then what are its direction cosines?

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If a line has direction ratios 2, -1, -2 then what are its direction cosines?

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It is given that

Direction ratios 2,-1,-2

We know that if (1,m,n) are the direction ratios then direction cosines can be written as

Therefore, the direction cosines of the having the direction ratios 2,-1,-2 is 2/3,-1/3,-2/3.

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