Problem 8.86. Define f : R R via f(x) = x. (a) Find two nonempty subsets...

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Problem 8.86. Define f : R R via f(x) = x. (a) Find two nonempty subsets A and B of R such that An B=0 but f-(A) = f(B). (b) Find two nonempty subsets A and B of R such that An B=0 but f(A) = f(B). Problem 8.86. Define f : R R via f(x) = x. (a) Find two nonempty subsets A and B of R such that An B=0 but f-(A) = f(B). (b) Find two nonempty subsets A and B of R such that An B=0 but f(A) = f(B).