2 |
3
| ||
5 |
cos(α+A)cos(α+B) |
cos2α |
| ||
5 |
2 |
2 |
a2+b2-c2 |
2ab |
-
| ||
2ab |
| ||
2 |
3π |
4 |
cos(α+A)cos(α+B) |
cos2α |
(cosαcosA-sinαsinA)(cosαcosB-sinαsinB) |
cos2α |
| ||
5 |
| ||
5 |
| ||
5 |
3π |
4 |
π |
4 |
3
| ||
5 |
| ||
2 |
3
| ||
5 |
| ||
2 |
| ||
10 |
| ||
10 |
| ||
2 |
3
| ||
5 |
| ||
5 |
3 |
4 |
1 |
tanA |
1 |
tanC |
2 |
3 |
π |
3 |
1 |
3 |
5 |
12 |
A.
| B.
| C.
| D.
|
π |
4 |
4 |
5 |
4π |
12 |
3 |
4 |
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