2 |
OB |
BC |
OD |
OB |
OC |
| ||||
4 |
OC |
sin120o |
OA |
sin15o |
AC |
sin45o |
| ||||
|
2
| ||
3 |
OA |
sin15o |
AC |
sin45o |
2
| ||
3 |
2
| ||
3 |
| ||||
4 |
| ||
3 |
2
| ||
3 |
2
| ||
3 |
| ||
2 |
2
| ||
3 |
| ||
3 |
| ||
3 |
OB |
OC |
OB |
OC |
| ||
3 |
| ||
3 |
| ||
3 |
1 |
3 |
CD |
CB |
OD |
OC |
OB |
OD |
OB |
OC |
x+1-x |
2 |
1 |
4 |
3 |
A.3-
| B.
| C.2 | D.3+
|
3 |
| ||
2 |
3 |
3 |
π |
4 |
2 |
A.
| B.
| C.
| D.
|
b2-a2-c2 |
ac |
cos(A+C) |
sinAcosA |
2 |
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