jakeyoda jakeyoda 18-10-2022 Mathematics contestada determine the elements of each of the following three sets explicitly, and justify your answers: • A = {n ∈ N : cos(nπ) greater than or equal to 0}; • B = {cos(nπ) : n ∈ N}; • C = {q + r : q, r ∈ Q ∩ [0, 1]}.