1-sin2170° |
A.cos170° | B.-cos170° | C.±cos170° | D.±|cos170°| |
1-sin2170° |
5 |
12 |
A.
| B.-
| C.
| D.-
|
1+sinx |
cosx |
1 |
2 |
cosx |
sinx-1 |
1-tanθ |
2+tanθ |
cos2θ |
1+sin2θ |
A.3 | B.-3 | C.-2 | D.-
|
AC |
BC |
AC |
BC |
2sin2a+sin2a |
1+tana |
π |
4 |
1 |
2 |
sin2α-cos2α |
1+cos2α |
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