2 |
3 |
A.锐角三角形 | B.直角三角形 | C.钝角三角形 | D.不确定 |
2 |
π |
4 |
2 |
3 |
3 |
4 |
1 |
tanA |
1 |
tanC |
BA |
BC |
3 |
2 |
1+
| ||||
sin(x+
|
3 |
5 |
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°| |
12 |
13 |
π |
2 |
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