4cos2α | ||||
cot
|
A.
| B.sin2α | C.-sin2α | D.2sin2α |
4cos2α | ||||
cot
|
4cos2α | ||||||||||||
|
4cos2α•sin
| ||||
cos2
|
1 |
2 |
π |
4 |
π |
6 |
π |
4 |
1+f(20°)+g(20°) |
1+f(20°)-g(20°) |
π |
6 |
3 |
cos4x+sin4x+sin2xcos2x |
sin6x+cos6x+2sin2xcos2x |
A.1 | B.sinx+cosx | C.sinxcosx | D.1+sinxcosx |
(1+cos2A)(1+cos2C) |
| ||
2 |
1 |
2 |
2 |
3 |
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