已知 a =(2sinωx,cosωx+sinωx) , b =(cosωx,cosωx-sinωx) ,(ω>0), 函数 f(x)= a ? b ,且函数f(x)的最周期为π. (I)求函数f(x)的解析式; (Ⅱ)求函数f(x)在 [0, π 2 ] 上的单调区间.
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