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)

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