已知函数a=(cos2x,-1),b=(1,cos(2x-π3)),设f(x)= 发布时间:2017-05-07 00:04 │ 来源:www.tikuol.com 题型:解答题 问题: 已知函数a=(cos2x,-1),b=(1,cos(2x-π3)),设f(x)=a•b+1.(1)求函数f(x)的最小正周期及单调递减区间;(2)设x为三角形的内角,且函数y=2f(x)+k恰有两个零点,求实数k的取值范围.
题型:解答题 — Whose exam paper is it?— It _____ be Jenny's. She always forgets to write her name on it. [ ]A. can't B. must C. shouldn't 查看答案