Q)
(chatquestion)...Serpendicular.
3
15. If u= 3 and vector u is equally inclined to the
e angle
unit vectors i j and k, find u.
16. If the line passing through origin makes
angles 0,, 0,, 0, with the planes XOY, YOZ
and ZOX respectively, then prove that
points
maving
cos² 0,+cos²0,+cos²0,32.
O and
17 If a variable line in two adjacent positions has
direction cosines I, m, n and +8l, m+ôm, n+8n,
3, 4),
s of
show that the small angle 80 between two
positions is given by (80)²=(8()²+(&m)²+(&n)*.
that two vectors whose direction
lotions al + bm + cn = 0
18. Prove
%3D
are
...
