AB |
AC |
A.450 | B.1350 | C.810 | D.990 |
AB |
AC |
2 |
AB |
cos218°+cos272° |
cos218°+sin218° |
AC |
4cos263°+4cos227° |
4(sin227°+cos227°) |
| ||||
|
|
| ||
2 |
OA |
OB |
π |
6 |
2π |
3 |
OC |
OA |
OB |
OC |
0 |
OC |
A.(0,
| B.(
| C.(
| D.(
|
a |
b |
2 |
a |
b |
| ||
2 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
AC/ |
AC |
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