a |
b |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
2 |
π |
4 |
π |
2 |
π |
4 |
π |
2 |
3 |
8 |
π |
8 |
3 |
8 |
π |
8 |
a |
b |
a |
b |
c |
1 |
2 |
| ||
5 |
2
| ||
5 |
a |
b |
c |
5
| ||
6 |
1-x |
5π |
4 |
3π |
2 |
A.2sinθ | B.-2cosθ | C.-2sinθ | D.2cosθ |
π |
2 |
sinα+2cosα |
4cosα-sinα |
2 |
π |
4 |
a |
b |
a |
b |
π |
3 |
OB |
OC |
OB |
OC |
OA |
A.直角三角形 | B.等腰直角三角形 |
C.等腰三角形 | D.等边三角形 |
C |
2 |
2 |
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