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已知向量 m =（1，sin（wx+ ））， n =（2，2sin（wx- ））（其中w为正常数）。 （Ⅰ）若w=1，x∈ ，求 m ∥ n 时，tanx的值； （Ⅱ）设f(x)= m · n -2，若函数f(x)的图像的相邻两个对称中心的距离为 ，求f(x)在区间[0， ]上的最小值。
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