3
You visited us
3
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard XII
Mathematics
Applications of Cross Product
If α, β, γ be...
Question
If
α
,
β
,
γ
be the direction angles of a vector and
c
o
s
α
=
14
15
,
c
o
s
β
=
1
3
t
h
e
n
c
o
s
γ
=
A
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
None of these
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is
A
c
o
s
2
α
+
c
o
s
2
β
+
c
o
s
2
γ
=
1
⇒
c
o
s
γ
=
√
1
−
(
14
15
)
2
−
(
1
3
)
2
=
√
8
9
−
(
196
225
)
=
±
2
15
.