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Consider f\ : R+vec[4,oo) given by f(x)=...

Consider `f\ : R_+vec[4,oo)` given by `f(x)=x^2+4` . Show that `f` is invertible with the inverse `f^(-1)` of `f` given by `f^(-1)(y)=sqrt(y-4),\ ` where `R_+` is the set of all non-negative real numbers.

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