作业帮 > 数学 > 作业

己知函数f(x)=√3sinxcosx+cos^2x-1/2.(1)求f(x)的单调区间(2)求f(x)在区间[-(5/

来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/13 02:04:00
己知函数f(x)=√3sinxcosx+cos^2x-1/2.(1)求f(x)的单调区间(2)求f(x)在区间[-(5/12)¶,(1/24)¶]上的最大值和最小值
己知函数f(x)=√3sinxcosx+cos^2x-1/2.(1)求f(x)的单调区间(2)求f(x)在区间[-(5/
f(x)=√3sinxcosx+cos^2x-1/2
=√3/2sin2x+1/2cos2x
=sin(2x+π/6)
1) 2kπ-π/2≤2x+π/6≤2kπ+π/2
kπ-π/3≤x≤kπ+π/6
单增区间:[kπ-π/3,kπ+π/6(k∈Z)]
单减区间:[kπ+π/6,kπ+2π/3(k∈Z)]
2) -π/3∈[-5π/12,π/24]
ymin=f(-π/3)=-1
ymax=f(π/24)=√2/2
再问: 谢谢你,
再答: 不用谢