π |
6 |
π |
2 |
2π |
2 |
π |
2 |
π |
6 |
π |
6 |
5π |
6 |
1 |
2 |
π |
6 |
π |
6 |
π |
2 |
π |
6 |
3π |
2 |
π |
3 |
5π |
6 |
2π |
3 |
π |
6 |
π |
3 |
5π |
6 |
2π |
3 |
π |
6 |
π |
3 |
5π |
6 |
A.y=cos2x | B.y=sin2x | C.y=tan2x | D.y=cos
|
sin
| ||
tan
|
A.① | B.② | C.③ | D.④ |
α |
2 |
α |
2 |
α |
2 |
A.第一象限角 | B.第二象限角 | C.第三象限角 | D.第四象限角 |
sin2120° |
A.±
| B.
| C.-
| D.
|
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