sinA+sinB |
cosA+cosB |
sinA+sinB |
cosA+cosB |
sinC |
cosC |
sinA+sinB |
cosA+cosB |
π |
3 |
π |
3 |
π |
3 |
π |
3 |
π |
3 |
π |
3 |
1-cos2A |
2 |
1-cos2B |
2 |
1 |
2 |
2π |
3 |
2π |
3 |
1 |
2 |
2π |
3 |
2π |
3 |
1 |
2 |
3 |
4 |
1 |
2 |
3 |
2 |
3 |
4 |
3 |
2 |
3 |
3 |
π |
12 |
a2+b2+c2 |
ab |
AB |
AC |
AO |
A.钝角三角形 | B.锐角三角形 | C.直角三角形 | D.下能确定 |
A.正三角形 | B.等腰三角形 |
C.直角三角形 | D.等腰直角三角形 |
π |
2 |
3π |
2 |
AC |
BC |
π |
2 |
2 |
3 |
|
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