观察下列各式: ① cos π 3 = 1 2 ; ② cos π 5 cos 2π 5 = 1 4 ; ③ cos π 9 cos 2π 9 cos 4π 9 = 1 8 ; ④ cos π 17 cos 2π 17 cos 4π 17 cos 8π 17 = 1 16 ; 归纳推出一般结论为______.
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