1-sin2160° |
A.-cos20° | B.cos20° | C.±cos20° | D.±|cos20°| |
1-sin220° |
cos220° |
12 |
13 |
π |
2 |
sinα+2cosα |
5cosα-sinα |
1-sin8 |
2+2cos8 |
A.2sin4-4cos4 | B.-2sin4-4cos4 |
C.-2sin4 | D.4cos4-2sin4 |
| ||
cos170°+
|
4 |
5 |
π |
2 |
AB |
2
| ||
5 |
π |
2 |
π |
2 |
5 |
13 |
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