1 |
2 |
cosα+sinα |
cosα-sinα |
A.2 | B.-2 | C.3 | D.-3 |
cosα+sinα |
cosα-sinα |
1+tanα |
1-tanα |
3 |
4 |
π |
4 |
3 |
4 |
1 |
tanA |
1 |
tanC |
BA |
BC |
3 |
2 |
AC |
BC |
OA |
OB |
OC |
A.sinα=
| ||||
B.sinα=0,且cosα=-1 | ||||
C.tanα=1,且cosα=-1 | ||||
D.α是第二象限角时,tanα=-
|
1-sin2160° |
A.-cos20° | B.cos20° | C.±cos20° | D.±|cos20°| |
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