If the direction ratios of two lines are 2, -3, 6 and 1, -2, 2 respectively then the angle between the lines is -

The directions rations of two lines are 3,2,-6 and , 1,2,2 respectively . The acute angle between these lines is

If the direction ratios of two lines are (1,2,4) and (-1,-2,-3) then the acute angle between them is

If the direction ratios of two lines are given by 3lm-4ln+mn=0 and l+2m+3n=0 then the angle between the lines is

If direction-cosines of two lines are proportional to 4,3,2 and 1, -2, 1, then the angle between the lines is :

If the direction ratio of two lines are given by 3lm-4ln+mn=0 and l+2m+3n=0 , then the angle between the lines, is

If the direction ratio of two lines are given by 3lm-4ln+mn=0 and l+2m+3n=0 , then the angle between the lines, is

The direction ratios of two lines are given by a+b+c=0, 2ab+2ac-bc=0 . Then the angle between the lines is

If the direction cosines of any two lines are (-2/3, 1/3, 2/3), (3/5, 4/5, 0) respectively, then the angle between those two lines is

The diection ratios of two lines are proportional to (2,3,-6) and (3,-4,5), then the acute angle between them is