|
→
a
×
→
b
|
=
|
→
a
|
⋅
|
→
b
|
⋅
sin
(
∠
→
a
,
→
b
)
|
a
→
×
b
→
|
=
|
a
→
|
⋅
|
b
→
|
⋅
sin
(
∠
a
→
,
b
→
)
|
→
a
×
→
b
|
=
|
→
a
|
⋅
|
→
b
|
⋅
sin
(
∠
→
a
,
→
b
)
|
a
→
×
b
→
|
=
|
a
→
|
⋅
|
b
→
|
⋅
sin
(
∠
a
→
,
b
→
)
|
→
a
×
→
b
|
|
a
→
×
b
→
|
Created with Highstock 2.0.4
0
1
2
3
4
5
6
7
8
9
10
0
a
a
a
a
1
b
b
1
∠
∠
1
Lisa
Close
Log in
Books
Repository
eAnswer
ePortfolio
Close
Log in
Books
Repository
eAnswer
ePortfolio
Log in
New user
OK
Error
Forgot?
Log in
Register
Recover
OK
Error
Change