Find $f$ if $f(f(x))=\sqrt{1-x^2} \land [-1; 1] \subseteq Dom(f)$$$$$Please give both real and complex functions. Can it be continuous or not (if f is real)
Find $f$ if $f(f(x))=\sqrt{1-x^2} \land [-1; 1] \subseteq Dom(f)$$$$$Please give both real and complex functions. Can it be continuous or not (if f is real)