f(x)=x2 Domain of f(x)=R Range of f(x)=R∕R− and g(x)=x1∕2=√x Domain of g(x)=R∕R− Range of g(x)=R∕R− ∵f(x) and g(x) are inverse to each other ⇒f(x) is bijective (i.e. one-one and onto) and g(x) isalso bijective (i.e. one-one and onto) ⇒ Domain of f, where f is one-one is R∕R− Also, co-domain = Range of f, (for onto) ⇒ co-domain =R∕R− ∴A=B=R∕R−