A.msin40° | B.mcos40° | C.mtan40° | D.
|
BC |
AB |
2 |
6 |
A.c=4
| B.cotA=
| ||||
C.sinA+cosB=1 | D.∠B=30° |
A.缩小2倍 | B.扩大2倍 | C.不变 | D.不能确定 |
3 |
4 |
A.0°<∠A<30° | B.30°<∠A<45° | C.45°<∠A<60° | D.60°<∠A<90° |
1 |
3 |
A.0°<∠A<30° | B.30°<∠A<45° | C.45°<∠A<60° | D.60°<∠A<90° |
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