【单选题】下列三个结论中正确结论的序号是 (1)角θ是第三象限角,则角 是第二、四象限角; (2)余弦函数y=cosx的最小正周期是2π; (3)“角α是钝角”是“cosα<0”成立的充要条件< /div>
【单选题】余弦函数y=cosx的最小正周期为( )
【单选题】You’re late. ____ late again.
【简答题】阅读理解,判断正(T)误(F)。 Reading papers Many people sleep late on Sunday morning, but others don't. However, almost everyone reads the paper. The Sunday paper is usually very thick.It has many advertisements ...