sin(-250°)cos70° |
cos2155°-sin225° |
A.-
| B.-
| C.
| D.
|
sin(-250°)cos70° |
cos2155°-sin225° |
-sin250°cos70° |
cos225°-sin225° |
-sin(180°+70°)cos70° |
cos225°-sin225° |
sin70°cos70° |
cos 50° |
sin140° |
2cos 50° |
sin40° |
2cos 50° |
cos50° |
2cos 50° |
1 |
2 |
π |
6 |
x |
2 |
3 |
A.等腰三角形 | B.直角三角形 |
C.等腰直角三角形 | D.锐角三角形 |
3 |
A.(
| B.(
| C.(
| D.(
|
A.等边三角形 | B.锐角三角形 | C.钝角三角形 | D.直角三角形 |
π |
3 |
1 |
2 |
| ||
2 |
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