Question

113. Ā=21+49-5k the directional cosines of the vector Ā are ...........
2.
4
5
3
A) 545
and
V45' 145
1 2
B)
and
145' 145
45
/45
4
4
3
2
C)
,0 and
D) 145' 45
J45
and
45
45​

Answer 1

Step-by-step explanation:

=

14

Let the directional cosines of vector r be cosα,cosβ,cosγ

We have cosα=

∣r∣

r.i

=

14

1

We have cosβ=

∣r∣

r.j

=

14

2

We have cosγ=

∣r∣

r.k

=

14

3

Therefore the directional cosines of given vector are

14

1

,

14

2

and

14

3

Answer By Mantra plz mark me brainlest