y=log1/3sin(π/3-2x)零和负数无对数,sin(π/3-2x)＞0,即-sin(2x-π/3)＞0,sin(2x-π/3)＜02kπ-π＜2x-π/3＜2kπ2kπ-2π/3＜2x＜2kπ+π/3kπ-π/3＜x＜kπ+π/6定义域（kπ-π/3,kπ+π/6）,其中k∈Z0＜sin(π/3...