tan39°+tan81°+tan240° |
tan39°tan81° |
3 |
tan39°+tan81°+tan240° |
tan39°tan81° |
tan120°(1-tan39°tan81°)+tan240° |
tan39°tan81° |
-tan120°tan39°tan81° |
tan39°tan81° |
3 |
3 |
sin10° |
cos10° |
sin60° |
cos60° |
sin10°cos60°-sin60°cos10° |
cos10°cos60° |
-sin40°cos40° |
cos10°cos60° |
1 |
2 |
3 |
π |
4 |
π |
2 |
3 |
3 |
5 |
2 |
7 |
2 |
1+sinα |
1-sinα |
A.2cos
| B.-2cos
| C.2sin
| D.-2sin
|
m |
x |
2 |
x |
2 |
n |
x |
2 |
x |
2 |
m |
n |
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