θ |
2 |
θ |
2 |
1-sinθ |
θ |
2 |
A.是第一象限角 |
B.是第三象限角 |
C.可能是第一象限角,也可能是第三象限角 |
D.是第二象限角 |
π |
2 |
π |
4 |
θ |
2 |
π |
2 |
θ |
2 |
θ |
2 |
1-sinθ |
(sin
|
θ |
2 |
θ |
2 |
θ |
2 |
θ |
2 |
θ |
2 |
θ |
2 |
θ |
2 |
π |
4 |
sinx |
1-cosx |
π |
3 |
A.y=sin(x-
| B.y=sin(x+
| C.y=sin(x+
| D.y=sin(2x-
|
3 |
5 |
π |
2 |
a |
2 |
π |
2 |
3 |
π |
2 |
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