有下列命题: ①函数y=4cos2x,x∈[-l0π,10π]不是周期函数; ②函数y=4cos2x的图象可由y=4sin2x的图象向右平移 π 4 个单位得到; ③函数y=4cos(2x+θ)的图象关于点( π 6 ,0)对称的-个必要不充分条件是θ= k 2 π+ π 6 (k∈Z); ④函数y= 6+ sin 2 x 2-sinx 的最小值为2 10 -4. 其中正确命题的序号是______.(把你认为正确的所有命题的序号都填上)
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