cosx+sinx |
cosx-sinx |
2 |
3 |
1 |
4 |
cosx+sinx |
cosx-sinx |
1+tanx |
1-tanx |
1+2 |
1-2 |
2 |
3 |
1 |
4 |
| ||||
cos2x+sin2x |
| ||||
1+tan2x |
7 |
12 |
π |
6 |
A.[-2,2] | B.[-
| C.[-1,1] | D.[-
|
π |
3 |
π |
2 |
6 |
5 |
24 |
13 |
A.
| B.
| C.
| D.
|
A.一定是锐角三角形 | B.一定是直角三角形 |
C.一定是钝角三角形 | D.是锐角或直角三角形 |
3 |
| ||
2 |
π |
2 |
3 |
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