x |
2 |
π |
4 |
x |
2 |
π |
4 |
x |
2 |
π |
4 |
x |
2 |
π |
4 |
x |
2 |
π |
4 |
3π |
2 |
π |
2 |
x |
2 |
π |
4 |
3π |
2 |
π |
2 |
π |
2 |
x |
2 |
π |
4 |
π |
2 |
π |
2 |
x |
2 |
π |
4 |
π |
2 |
3π |
2 |
π |
2 |
π |
2 |
A.y=sinx | B.y=-x3 | C.y=(
| D.y=log2(x+3) |
A.[-2,2] | B.[-
| C.[-1,
| D.[1,
|
π |
6 |
π |
6 |
π |
6 |
π |
3 |
3 |
A.正弦函数、余弦函数的定义域是R,值域是[-1,1] | ||||
B.余弦函数当且仅当x=2kπ( k∈Z) 时,取得最大值1 | ||||
C.正弦函数在[2kπ+
| ||||
D.余弦函数在[2kπ-π,2kπ]( k∈Z)上都是减函数 |
A.[2kπ,2kπ+
| B.[2kπ+
| ||||
C.[2kπ-π,2kπ-
| D.[2kπ-
|
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