f(x)=log2 √(1-sin²x)=log2|cosx|1、定义域cosx≠0x≠kπ+π/22、值域|cosx|≤1f(x)∈(-∞,0]3、单调区间x∈(2kπ-π/2,2kπ]增函数x∈(2kπ,2kπ+π/2)减函数4、奇偶性f(-x)=log2|cos(-x)|=log2|cosx|=f(x)偶...