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CBSE Class 12 Math 2012 Solved Paper

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Question : 5
Total: 29
If a line has direction ratios 2,-1,-2 then what are its direction cosines?
Solution:  
The direction 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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