a |
b |
1 |
2 |
a |
a |
b |
7π |
12 |
a |
a |
b |
cos2x+1 |
2 |
1 |
2 |
| ||
2 |
π |
4 |
1 |
2 |
2π |
2 |
| ||
2 |
π |
4 |
1 |
2 |
π |
4 |
| ||
2 |
π |
4 |
π |
4 |
5π |
4 |
π |
4 |
3π |
4 |
π |
4 |
7π |
12 |
π |
3 |
BC |
sinA |
AC |
sinB |
BCsinB |
sinA |
6 |
π |
4 |
π |
4 |
3π |
4 |
A.①②④ | B.①③ | C.②③ | D.③④ |
A.-4
| B.±4
| C.
| D.4
|
A.-
| B.
| C.-
| D.-
|
π |
2 |
π |
12 |
2 |
3
| ||
2 |
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