QUESTION 2 Let (R2, | . /2) be the normed space (defined in this module) , and define D := (xER' : (xitx?)(x1 -1) 2 0}. Let f : D -> R be the function given by f(x) = V(x]+x3)(21 -1). Prove, using only the definition, that f is continuous at 0. (Justify all the claims made.)