抱歉,刚刚停电,下线了


p=2x√3/2cosθ+2x1/2sinθ
=√3cosθ+sinθ
p^2=x^2+y^2
p^2=√3pcosθ+psinθ
x^2+y^2=√3x+y

所以是
x^2+y^2-√3x-y=0
(x-√3/2)^2-3/4+(y-1/2)^2-1/4=0
(x-√3/2)^2+（y-1/2)^2=1

所以A对