What is the angle between the two lines whose direction numbers are `(sqrt3-1,-sqrt3-1,4)and(-sqrt3-1,sqrt3-1,4)`?

The angle between the lines whose direction ratios are 1,1,2,sqrt3-1,-sqrt3-1,4 is

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

Find the angle between the lines whose direction ratios are (1,1,2)(sqrt(3), -sqrt(3),0)

Find the angle between the lines having direction ratios 1,1,2 and sqrt3-1,-sqrt3-1,4

Find the angle between the lines having direction ratios 1,1,2 and sqrt3-1,-sqrt3-1,4

The acute angle between the straight lines whose direction numbers are 1, 1, 2 and (sqrt(3)-1),(-sqrt(3),-1), 4 is -

Find the angle between two lines whose direction ratios are proportional to 1,1,2 and (sqrt(3)-1),(-sqrt(3)-1),4