Vector 3DHard
Question
The direction ratios of lines intersecting the line 
at angle 60o can be -
at angle 60o can be -Options
A.1, 1, 2
B.1, 2, -1
C.1, -1, 2
D.1, -2, 1
Solution
cos60o = 
.
where l, m, n are DR′s of required line.
. where l, m, n are DR′s of required line.
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