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[" 44.If "Y={n^(2):n in N}sub N" and "],...

[" 44.If "Y={n^(2):n in N}sub N" and "],[f:N rarr Y" is a function defined by "],[f(n)=n^(2)" ,then the inverse of "f" is "],[[" (1) "f^(-1)(y)=sqrt(y)," (2) "f^(-1)(y)=-sqrt(y)],[" (3) "f^(-1)(y)=y," (4) "f^(-1)(y)=(y)/(2)]]

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