切点有两个(3,3)和(x,y)
AC所在直线斜率2
切点连线斜率-1/2
(y-3)/(x-3)=-1/2
x^2+y^2-4x-6y+12=0
两个方程联立解得切点(3,3)(7/5,19/5)
切线方程有两个
x=3
y=(3/4)x+11/4
切点有两个(3,3)和(x,y)
AC所在直线斜率2
切点连线斜率-1/2
(y-3)/(x-3)=-1/2
x^2+y^2-4x-6y+12=0
两个方程联立解得切点(3,3)(7/5,19/5)
切线方程有两个
x=3
y=(3/4)x+11/4