The angle between the lines with direction ratios `(1, 0, pm cos alpha )` is `60^o`. What is the value of `alpha` ?

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Q 2876312276.     The angle between the lines with direction ratios
`(1, 0, pm cos alpha )` is `60^o`. What is the value of `alpha` ?
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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