The equations of a line are 
Find the direction cosines of a line parallel to this line.
Given : A line 
To find : Direction cosines of the line parallel to 
Formula used : If a line is given by 
= 
= 
then direction cosines are given by 
, 
, 
The line is 
= 
= 
Parallel lines have same direction ratios and direction cosines
Here l = -2 , m = 2 , n = 1
Direction cosines of the line 
= 
= 
is
, 
, 
= 
, 
, 
= 
, 
, 
= 
, 
, 
Direction cosines of the line parallel to the line 
= 
= 
is
, 
, 
1