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[" Find the angle between the lines whose direction cosines satisfy the equations "],[1+m+n=0,1^(2)+m^(2)-n^(2)=0]

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Find the angle between the lines whose direction cosines satisfy the equaitons l + m + n = 0, l^(2) + m^(2) - n^(2) = 0 .

The angle between the lines whose direction cosines satisfy the equation l+m+n=0 and l^(2)=m^(2)+n^(2) is

The angle between the lines whose direction cosines satisfy the equations l+m+n=0 " and " l^(2)=m^(2)+n^(2) is

The angle between the lines whose direction cosines satisfy the equations l+m+n=""0 and l^2=m^2+n^2 is

The angle between the lines whose direction cosines satisfy the equations l+ m +n =0 and l^2= m^2 + n^2 is: