1 |
tan2x |
2(3+cos4x) |
1-cos4x |
sin2x |
cos2x |
cos2x |
sin2x |
sin4x+cos4x |
sin2xcos2x |
(sin2x+cos2x)2-2sin2xcos2x | ||
|
8-4sin22x |
1-cos4x |
4+4cos22x |
1-cos4x |
4+2(1+cos4x) |
1-cos4x |
2(3+cos4x) |
1-cos4x |
1 |
tan2x |
2(3+cos4x) |
1-cos4x |
A.
| B.
| C.1 | D.
|
A.1 | B.0 | C.-1 | D.不能确定 |
π |
12 |
π |
3 |
2 |
3 |
A.锐角三角形 | B.直角三角形 | C.钝角三角形 | D.等腰三角形 |
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