x2 |
a2 |
y2 |
b2 |
A..
| B..
| C..
| D.
|
c |
a |
1 |
sin75°-cos75° |
1 |
sin(45°+30°)-sin(45°-30°) |
2 |
x2 |
a2 |
y2 |
b2 |
2 |
A.[
| B.[
| C.[
| D.[
|
x2 |
1+k |
y2 |
1-k |
A.-1<k<1 | B.k>0 | C.k≥0 | D.k>1或k<-1 |
x2 |
a2 |
y2 |
b2 |
|PF2|2 |
|PF1| |
A.(1,+∞) | B.(0,3] | C.(1,3] | D.(0,2] |
x2 |
a2 |
y2 |
5 |
A.
| B.
| C.
| D.
|
x2 |
4 |
y2 |
b2 |
A.
| B.4
| C.3 | D.5 |
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