a+b |
c |
A.(1,2) | B.(1,
| C.(1,
| D.[1,
|
a |
sinA |
b |
sinB |
c |
sinC |
a+b |
c |
csinA+csinB |
c |
csinA+csinB |
c |
2 |
π |
4 |
π |
2 |
π |
2 |
π |
4 |
| ||
2 |
a+b |
c |
2 |
A.10
| B.20
| C.20
| D.20
|
3 |
2 |
A.30° | B.45° | C.135° | D.45°或135° |
A.3 | B.
| C.
| D.
|
6 |
A.60° | B.120° | C.30° | D.60°或120° |
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