Q 1163478345.     The angle between the lines whose direction cosines are `(sqrt3/4,1/4,sqrt3/2)`and `(sqrt3/4,1/4,-sqrt3/2)`, is

EAMCET 2008
A

`pi`

B

`pi/2`

C

`pi/3`

D

`pi/4`

HINT

Given, `l_1=sqrt3/4,m_1=1/4,n_1=sqrt3/2` and `l_2=sqrt3/4,m_2=1/4,n_2=-sqrt3/2` `costheta=|(l_1l_2+m_1m_2+n_1n_2)/(sqrt(l_1^2+l_2^2+l_3^2)sqrt(m_1^2+m_2^2+m_3^2))|`

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