π |
3 |
π |
3 |
2 |
π |
3 |
π |
3 |
π |
3 |
π |
3 |
| ||
2 |
1 |
2 |
| ||
2 |
1 |
2 |
3 |
4 |
1 |
4 |
3 |
2 |
1 |
2 |
3 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
2π |
3 |
π |
3 |
2 |
| ||
2 |
a |
sinA |
b |
sinB |
bsinA |
a |
3×
| ||||
2
|
3
| ||
8 |
sinA |
a |
cosB |
b |
cosC |
c |
A.等边三角形 |
B.有一个角为30°的直角三角形 |
C.等腰直角三角形 |
D.有一个角为30°的等腰三角形 |
sin65°+sin15°sin10° |
sin25°-cos15°cos80° |
π |
3 |
π |
12 |
3 |
π |
6 |
A.①② | B.②③ | C.②④ | D.③④ |
5 |
6 |
A.
| B.
| C.-
| D.-
|
π |
4 |
5π |
12 |
π |
6 |
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