Check the injectivity and surjectivity of the following functions:(i) f: N → N given by f(x) = x^2 (ii) f: Z → Z given by f(x) = x^2 (iii) f: R → R given by f(x) = x^2 (iv) f: N → N given by f(x) = x^3 (v) f: Z → Z given by f(x) = x^3
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