参数方程求解.

问题描述:

参数方程求解.
大括号
X=4T/4-T^2
Y=4(4+T^2)/4-t^2
T为参数.
求普通方程.

x+y/4=(4t+4+t^2)/(4-t^2)=(t+2)^2/(4-t^2)=(t+2)/(2-t)
x-y/4=(4t-4-t^2)/(4-t^2)=(t-2)^2/(t^2-4)=(t-2)/(t+2)
(x+y/4)(x-y/4)=-1