α
β
γ
cos
α
=
v
⋅
i
|
v
|
|
i
|
=
v
1
|
v
|
=
2
√
2
2
+
3
2
+
2
2
=
2
√
17
α
=
cos
−
1
(
2
√
17
)
≈
1.064
rad
cos
β
=
v
⋅
j
|
v
|
|
j
|
=
v
2
|
v
|
=
3
√
2
2
+
3
2
+
2
2
=
3
√
17
β
=
cos
−
1
(
3
√
17
)
≈
0.756
rad
cos
γ
=
v
⋅
k
|
v
|
|
k
|
=
v
3
|
v
|
=
2
√
2
2
+
3
2
+
2
2
=
2
√
17
γ
=
cos
−
1
(
2
√
17
)
≈
1.064
rad
v
=
⟨
,
,
⟩