Find the angle between each of the following pairs of lines:
and 
Given – 
& 
To find – Angle between the two pair of lines
Direction ratios of L1 = (1,-1,-2)
Direction ratios of L2 = (3,-5,-4)
Tip – If (a,b,c) be the direction ratios of the first line and (a’,b’,c’) be that of the second, then the angle between these pair of lines is given by 
The angle between the lines
1