a2-b2 |
c2 |
sin(A-B) |
sinC |
a2-b2 |
c2 |
acosB-bcosA |
c |
a |
c |
sinA |
sinC |
b |
c |
sinB |
sinC |
a2-b2 |
c2 |
sinAcosB-sinBcosA |
sinC |
sin(A-B) |
sinC |
π |
6 |
| ||
2 |
2π |
3 |
A.
| B.-
| C.±
| D.
|
3 |
A.等腰直角三角形 | B.等腰三角形 |
C.直角三角形 | D.等边三角形 |
1-cos2α |
sinαcosα |
1 |
3 |
A.
| B.
| C.
| D.
|
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