The diection cosines of two lines are proportional to `(2,3,-6) and (3,-4,5),` then the acute angle between them is (A) `cos^-1{49/36}` (B) `cos^-1 {(18sqrt(2))/35}` (C) `96^0` (D) `cos^-1(18/35)`

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

If the direction cosines of two lines are proportional to 2,3,-6 and 3 ,-4,5, then the acute angle between then

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

If direction ratios of two lines are 5,-12,13 and -3,4,5 , then the angle between them is a) cos^(-1)((1)/(65)) b) cos^(-1)((2)/(65)) c) cos^(-1)((3)/(65)) d) (pi)/(2)

The angle between the lines whose direction cosines are proportional to (1,2,1) and (2,-3,6) is

If the d.r's of two lines are (x,3,5) and (2,-1,2) and if the anlgle between those lines is 45^(@) , then x =

The acute angle between the lines whose direction cosines are proportional to 3,-1,2 and 2,1,-3 is

If the direction cosines of two lines are (1)/(sqrt(6)),(-1)/(sqrt(6)),(2)/(sqrt(6))and(2)/(sqrt(6)),(1)/(sqrt(6)),(-1)/(sqrt(6)) respectively, then the acute angle between them is: a) cos^(-1)((-1)/(6)) b) cos^(-1)((1)/(6)) c) cos^(-1)((-1)/(sqrt(6))) d) cos^(-1)((1)/(sqrt(6)))

What are the co-ordinates of the mid-point of A(1,4) and D(3,5) ?