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If the length of a vector be 7 and direc...

If the length of a vector be 7 and direction ratios be 2, -3, 6,
then its direction cosines are

A

(a) `(2)/(21),(-1)/(7),(2)/(7)`

B

(b) `(2)/(7),(-3)/(7),(6)/(7)`

C

(c) `(2)/(7),(3)/(7),(6)/(7)`

D

(d) `(2)/(3),(-7)/(3),(6)/(3)`

Text Solution

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The correct Answer is:
B
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