f(x)=4sin^2[(π+2x)/4].sinx+(cosx+sinx)(cosx-sinx)①求最小周期②已知常数w>0,若函数y=f(wx)在区间[-π/2,2π/3]上是增函数,求w的取值范围③若方程f(x)(sinx-1)+a=0有解,求实数a的取值范围
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