当x趋向下列式中何值时,arctan[1/(1-x)]趋向π/2()? A.1+ B 发布时间:2017-05-20 21:16 │ 来源:www.tikuol.com 题型:单项选择题 问题: 当x趋向下列式中何值时,arctan[1/(1-x)]趋向π/2()?A.1+B.1-C.+∞D.-∞