OA |
OB |
OC |
0 |
OA |
OB |
OB |
OC |
OC |
OA |
A.直角三角形 | B.等边三角形 |
C.等腰三角形 | D.边长不等的锐角三角形 |
OA |
OB |
OC |
0 |
OD |
OC |
OD |
OC |
OA |
OB |
OB |
OC |
OC |
OA |
OB |
OA |
OC |
OB |
CA |
OB |
CA |
OA |
CB |
OC |
BA |
A.锐角三角形 | B.等边三角形 | C.等腰三角形 | D.钝角三角形 |
A.(1)(2) | B.(3) | C.(2)(3) | D.(1)(3) |
| ||
5 |
3
| ||
10 |
A.锐角三角形 | B.钝角三角形 | C.直角三角形 | D.等边三角形 |
cos2x+sin2x |
cos2x-sin2x |
A.2π | B.π | C.
| D.
|
A.(1,
| B.(
| C.(
| D.(1,
|
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