AB |
A.[0,5] | B.[1,5] | C.(1,5) | D.(0,5) |
AB |
(2cosθ-3cosα) 2+(2sinθ-3sinα)2+(1-1)2 |
4(cos2θ+sin2θ)+9(cos2α+sin2α)-12(cosαcosθ+sinαsinθ) |
13-12cos(α-θ) |
AB |
AB |
AB |
OA |
OB |
OC |
A.
| B.
| C.
| D.
|
a |
b |
a |
b |
A.17或-1 | B.-17或1 | C.-1 | D.1 |
a |
AB |
b |
AC |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
B |
a |
b |
a |
a |
b |
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