a |
b |
b |
b |
a |
π |
6 |
b |
A.4 | B.2
| C.2 | D.
|
b |
OB |
b |
a |
AB |
b |
b |
a |
π |
6 |
b |
a |
π |
6 |
2 | ||
sin
|
b |
a |
b |
a |
b |
a |
b |
7 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.2
| B.2
| C.4 | D.12 |
a |
e1 |
e2 |
b |
e1 |
e2 |
e1 |
e2 |
a |
b |
a |
b |
a |
b |
a, |
b |
a |
b |
a |
b |
a, |
b |
a |
b |
c |
a |
b |
a |
b |
1 |
2 |
a |
c |
b |
c |
c |
A.
| B.
| C.
| D.1 |
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