a |
b |
a |
b |
a |
b |
a |
b |
1 |
8 |
1-2m |
m |
m+1 |
m |
tanA+tanB |
1-tanAtanB |
1-2m |
m |
1 |
2 |
1 |
8 |
1 |
8 |
3 |
4 |
m+1 |
m |
3 |
4 |
PA |
PB |
PC |
0 |
AB |
AC |
AP |
A.3 | B.
| C.2 | D.8 |
A.(9,1) | B.(1,9) | C.(9,0) | D.(0,9) |
. |
DA |
. |
DC |
. |
DB |
A.(2,1) | B.(2,2) | C.(1,2) | D.(2,4) |
AB |
BC |
CD |
AD |
BC |
AC |
BD |
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