Question

x=根号（3）+2cosa ,y=1+2sina (a为参数 0

Answer 1

x=√3+2cosa ,

x-√3=2cosa 平方

(x-√3)^2=4cos^2a.1

y=1+2sina

y-1=2sina平方

(y-1)^2=4sin^2a.2

1式+2式得

(x-√3)^2+(y-1)^2=4