sin(2π-α)sin(π+α)cos(-π-α) |
sin(3π-α)•cos(π-α) |
3 |
sin(2π-α)sin(π+α)cos(-π-α) |
sin(3π-α)•cos(π-α) |
-sinα(-sinα)cos(π+α) |
sin(π-α)•(-cosα) |
sin2α(-cosα) |
sinα•(-cosα) |
3 |
3 |
sin10° |
cos10° |
cos10°+
| ||
cos10° |
2(
| ||||||
cos10° |
2sin40° |
cos10° |
2sin40°cos40° |
cos10° |
sin80° |
cos10° |
cos10° |
cos10° |
A.-1 | B.0 | C.1 | D.2 |
sin(2π-θ)•tan(π+θ)•cot(-θ-π) |
cos(π-θ)•tan(3π-θ) |
2 |
3 |
A.在[0,π]上是增函数,在[π,2π]上是减函数 | ||||||||
B.在[
| ||||||||
C.在[π,2π]上是增函数,在[0,π]上是减函数 | ||||||||
D.在[0,
|
π |
4 |
| ||
5 |
π |
4 |
3π |
4 |
π |
4 |
4sin(α-π)-sin(
| ||
3cos(α-
|
sin2α-2sinαcosα-cos2α |
4cos2α-3sin2α |
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