If \( l, m \) and \( n \) are the direction cosines of a line \( P Q \) then the value of \( l^{....

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If \( l, m \) and \( n \) are the direction cosines of a line \( P Q \) then
\( \mathrm{P} \)
the value of \( l^{2}+m^{2}+n^{2} \) is
W
(1) 0
(2) 1
(3) 2
(4) None of these


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