已知函数f(x)=sin2x+cos2x-1
问题描述:
已知函数f(x)=sin2x+cos2x-1
(1)求f(x)的最小正周期和最大值;
(2)求f(x)的单调递增区间
答
f(x)=√2sin(2x+π/4)-1
(1)最小正周期π;最大值√2
(2)2kπ-π/2≤2x+π/4≤2kπ+π/2
2kπ-3π/4 ≤2x ≤2kπ+π/4
2kπ-3π/8≤x≤2kπ+π/8