What is the angle between the lines whose direction cosines are proportional to `(2, 3, 4)` and `(1, -2, 1)`, respecti

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Q 2319156919.     What is the angle between the lines whose
direction cosines are proportional to `(2, 3, 4)` and
`(1, -2, 1)`, respectively?
NDA 2011 Paper 1
A

`90^(circ)`

B

`60^(circ)`

C

`45^(circ)`

D

`30^(circ)`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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