Three lines with direction ratios `1,1,2; sqrt3-1,-sqrt3-1,4;-sqrt3-1,sqrt3-1,4`, enclose

Three lines with direction ratios lt 1, 1,2 gtlt sqrt3-1 , -sqrt3-1,4 gt and lt - sqrt3-1, sqrt3-1, 4 gt form

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

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

Find the acute angle between the pair of straight lines whose direction cosines are sqrt3/4,-1/4,-sqrt3/2 and -sqrt3/4,1/4,-sqrt3/2 .