[" 21.If "A=(1,-2,-1),B=(4,0,-3),C=(1,2,-1),D=(2,-4,-5)" then find the distance "],[" between "AB" and "CD]

If A=(1,-2,-1) , B=(4,0,-3),C= (1,2,-1),D=(2,-4,-5) then find distance between bar(AB),bar(CD)

If A=(1, -2, -1), B= (4, 0, -3), C = (1, 2, -1), D=(2, -4, -5) , then distance between AB and CD is

A : If A = (1, -2, -1) B = (4, 0, - 3), C = (1,2 - 1), d = (2, -4,-5) then the distance between AB and CD is 4/3 R : The shortest distance between the skew lines r = a + sb, r = c + td is ([a - c b d])/(|b xx d|)

If A-=(3,4-2),B-=(1,-1,2),C-=(0,3,2) and D-=(3,5,6) , then the angle between bar(AB) and bar(CD) is

If the coordinates of the points A,B,C,D are (1,2,3),(4,5,7),(-4,3,-6) and 2,9,2,2, then find the angle between AB and CD.

If A,B,C,D are (2,3,-1),(3,5,-3),(1,2,3),(3,5,7) respectively, then the angel between AB and CD, is