3 |
π |
2 |
) |
2π |
3 |
1-cos2ωx |
2 |
| ||
2 |
| ||
2 |
1 |
2 |
1 |
2 |
π |
6 |
1 |
2 |
2π |
2ω |
π |
6 |
1 |
2 |
π |
6 |
3π |
4 |
kπ |
2 |
π |
12 |
1 |
2 |
π |
6 |
1 |
2 |
2π |
3 |
π |
6 |
π |
6 |
7π |
6 |
1 |
2 |
π |
6 |
π |
6 |
1 |
2 |
3 |
2 |
3 |
2 |
3 |
5 |
7 |
13 |
A.锐角三角形 |
B.钝角三角形 |
C.直角三角形 |
D.可能是锐角三角形,也可能是钝角三角形. |
1-2sinαcosα |
cos2α-sin2α |
1+2sinαcosα |
1-2sin2α |
3 |
2 |
π |
2 |
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