201 6 814 (20 (1) (x — a)(x — af(b) — bf(a) f(a) -f(b) a—b

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Page 1: 201 6 814 (20 (1) (x — a)(x — af(b) — bf(a) f(a) -f(b) a—b
Page 2: 201 6 814 (20 (1) (x — a)(x — af(b) — bf(a) f(a) -f(b) a—b