PM = (1 - x, -y)
PN = (-x, -y)
PM · PN = (x - 1) * x + y ^ 2
= x ^ 2 - x + y ^ 2
= 3 / 4
由上式得
(x - 1 / 2) ^ 2 + y ^ 2 = 1
所以点P的轨迹是以点(1/2, 0)为圆心,1为半径的圆周.
PM = (1 - x, -y)
PN = (-x, -y)
PM · PN = (x - 1) * x + y ^ 2
= x ^ 2 - x + y ^ 2
= 3 / 4
由上式得
(x - 1 / 2) ^ 2 + y ^ 2 = 1
所以点P的轨迹是以点(1/2, 0)为圆心,1为半径的圆周.