The direction cosines of the line drawn ...

The direction cosines of the line drawn from `P(-5,3,1)` to Q(1,5,-2) is

A

`lt 6,2 , -3 gt`

B

` lt 2, -4,1 gt`

C

`lt (2)/(sqrt21), (-4)/(sqrt21), (1)/(sqrt21) gt`

D

`lt (6)/(7), (2)/(7), - (3)/(7) gt`

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The correct Answer is:

D

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