If the angle between the lines with direction ratios `(1,0 , pm cos alpha)` is `60^(circ)` , then what is the value
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Q 2359378214.
If the angle between the lines with direction ratios
`(1,0 , pm cos alpha)` is `60^(circ)` , then what is the value of `alpha`?
NDA 2008 Paper 1
A
`cos^(-1) (1/sqrt(2) )`
B
`cos^(-1) (1/sqrt(3) )`
C
`cos^(-1) (1/3 )`
D
`cos^(-1) (1/2 )`
HINT
Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)
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