If a line has direction ratios 2, -3, 7 then find the direction cosine – McqOptions

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1.	If a line has direction ratios 2, -3, 7 then find the direction cosines.
A.	l= ( frac{2}{ sqrt{62}},m=- frac{7}{ sqrt{62}},n= frac{7}{ sqrt{62}} )
B.	l= ( frac{2}{ sqrt{6}},m=- frac{3}{ sqrt{6}},n= frac{7}{ sqrt{6}} )
C.	l=- ( frac{2}{ sqrt{62}},m=- frac{3}{ sqrt{62}},n=- frac{7}{ sqrt{62}} )
D.	l= ( frac{2}{ sqrt{62}},m=- frac{3}{ sqrt{62}},n= frac{7}{ sqrt{62}} )
Answer» E.

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