x |
2 |
x |
2 |
cos2x | ||||
|
x |
2 |
x |
2 |
x |
2 |
2tan
| ||
1-tan2
|
2×2 |
1-22 |
4 |
3 |
cos2x-sin2x | ||||||||||
|
(cosx-sinx)(cosx+sinx) |
(cosx-sinx)sinx |
cosx+sinx |
sinx |
3 |
4 |
1 |
4 |
1-sin2170° |
A.cos170° | B.-cos170° | C.±cos170° | D.±|cos170°| |
4
| ||
7 |
11 |
14 |
1+sinx |
cosx |
1 |
2 |
cosx |
sinx-1 |
A.1 | B.2 | C.0 | D.2sin2α |
2
| ||
3 |
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