a |
a |
b |
1 |
2 |
a |
b |
1 |
2 |
a |
b |
A.30° | B.45° | C.60° | D.120° |
a |
a |
b |
1 |
2 |
a |
b |
1 |
2 |
a |
a |
b |
b |
1 |
2 |
b |
1 |
2 |
b |
| ||
2 |
a |
b |
a |
b |
1 |
2 |
| ||
2 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
3 |
b |
3 |
a |
b |
a |
b |
A.30° | B.60° | C.120° | D.150° |
π |
2 |
a |
1 |
2 |
| ||
2 |
a |
b |
a |
b |
a |
b |
a |
b |
e1 |
e2 |
e1 |
e |
a |
e1 |
e2 |
b |
e1 |
e2 |
a |
b |
a |
b |
a |
a |
b |
a |
b |
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