a | ||
cos
|
b | ||
cos
|
c | ||
cos
|
A.等腰三角形 | B.等边三角形 |
C.直角三角形 | D.等腰直角三角形 |
a | ||
cos
|
b | ||
cos
|
c | ||
cos
|
sinA | ||
cos
|
sinB | ||
cos
|
sinC | ||
cos
|
2sin
| ||||
cos
|
2sin
| ||||
cos
|
2sin
| ||||
cos
|
A |
2 |
B |
2 |
C |
2 |
A |
2 |
B |
2 |
C |
2 |
π |
2 |
A |
2 |
B |
2 |
C |
2 |
π |
3 |
A |
2 |
π |
4 |
sin2α-cos2α |
1+cos2α |
cos(C-B) |
sinA+sin(C-B) |
3 |
| ||
2 |
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