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The angle between a line with direction ...

The angle between a line with direction ratio proportional to 2,2,1 and a line joining (3,1,4) and (7,2,12) is

A

`(cos^(-1))(2/3)`

B

`(cos^(-1))(-2/3)`

C

`(tan^(-1))(2/3)`

D

none of these

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The correct Answer is:
A
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