sinA+sinB |
cosA+cosB |
3 |
sinA+sinB |
cosA+cosB |
1 |
2 |
| ||||
4 |
a |
sinA |
c |
sinC |
a | ||||
|
c | ||||
|
| ||
|
1 |
2 |
1 |
2 |
| ||
|
| ||||
4 |
3 |
3 |
| ||
|
2 |
A.cos(A-B)=cosAcosB-sinAsinB |
B.cos(A+B)=cosAsinB-sinAcosB |
C.sin(A+B)=sinAsinB+cosAcosB |
D.sin(A-B)=sinAcosB-cosAsinB |
A.16 | B.8 | C.4 | D.2 |
A.-
| B.
| C.
| D.-
|
A.2 | B.5 | C.4 | D.1 |
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