6 |
6 |
a |
sinA |
b |
sinB |
3 |
sinA |
2
| ||
sin2A |
2
| ||
2sinAcosA |
| ||
3 |
6 |
6 |
| ||
3 |
A.1:
| B.1:2:4 | C.2:3:4 | D.1:
|
A.a=7,b=14,A=30°,有两解 |
B.a=30,b=25,A=150°,有一解 |
C.a=6,b=9,A=45°,有两解 |
D.a=9,b=10,A=60°,无解 |
A.(2,+∞) | B.(0,2) | C.(2,2
| D.(
|
A.30° | B.60° | C.90° | D.120° |
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