A.sinα=
| ||||
B.sinα=0,且cosα=-1 | ||||
C.tanα=1,且cosα=-1 | ||||
D.α是第二象限角时,tanα=-
|
| ||
2 |
| ||
2 |
sinα |
cosα |
1-sin2160° |
A.-cos20° | B.cos20° | C.±cos20° | D.±|cos20°| |
12 |
13 |
π |
2 |
sinα+2cosα |
5cosα-sinα |
1-sin8 |
2+2cos8 |
A.2sin4-4cos4 | B.-2sin4-4cos4 |
C.-2sin4 | D.4cos4-2sin4 |
| ||
cos170°+
|
4 |
5 |
π |
2 |
© 2017-2019 超级试练试题库,All Rights Reserved.