Hi everyone.

I'm confused about this function

y=f(x)=sqrt(1+(sqrt(1-(x^2-1)^2)))

I need to explain what is wrong but can not figure out nothing sensible. Also i need to say what does this function look like, in relation to the curve:

(x^2 - 1)^2 + (y^2 - 1)^2 = 1

Thx for any help