a |
b |
c |
π |
6 |
a |
c |
a |
b |
π |
6 |
| ||||
|
|
-cosx | ||||
|
π |
6 |
| ||
2 |
5π |
6 |
a |
b |
2 |
π |
4 |
2π |
2 |
π |
6 |
5π |
6 |
x |
2 |
3 |
π |
3 |
1 |
3 |
cos2a |
1+cos2a-sin2a |
π |
2 |
| ||
2 |
π |
2 |
A.-
| B.
| C.-
| D.
|
π |
2 |
π |
12 |
π |
2 |
A.(-cosα,sinα) | B.(-sinα,cosα) | C.(cosα,sinα) | D.(sinα,cosα) |
a |
3 |
b |
a |
b |
π |
6 |
π |
2 |
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