x |
2 |
3 |
x |
2 |
x |
2 |
1 |
2 |
π |
6 |
1 |
2 |
x |
2 |
3 |
x |
2 |
x |
2 |
1 |
2 |
1-cosx |
2 |
| ||
2 |
1 |
2 |
| ||
2 |
1 |
2 |
π |
6 |
π |
6 |
π |
2 |
π |
3 |
2π |
3 |
π |
3 |
2π |
3 |
π |
6 |
π |
6 |
1 |
2 |
x1+x2 |
2 |
π |
2 |
x3+x4 |
2 |
π |
2 |
x2n-1+x2n |
2 |
π |
2 |
n(n-1) |
2 |
A.偶函数且在(0,+∞)上单调递增 |
B.奇函数且在(0,+∞)上单调递减 |
C.奇函数且在(0,+∞)上单调递增 |
D.偶函数且在(0,+∞)上单调递减 |
x |
3 |
A.-3 | B.-2 | C.-1 | D.0 |
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