Vertical cross-sections are hyperbolae.

z^2=x^2+y^2

x=n

vector(x,y,z)=vector(n,t,plusorminus(sqrt(n^2+t^2))),'radius'=0.05,-2<z<2

prime(y)=plusorminus(sqrt(n^2+prime(x)^2))

Graph of the formula

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