已知函数f(x)=根号sinxcosx+cos2x+1 (1)求f(x)的最小正周期及单调递减区间
问题描述:
已知函数f(x)=根号sinxcosx+cos2x+1 (1)求f(x)的最小正周期及单调递减区间
答
f(x)=2根号3sinxcosx+cos2x+1
=根号3sin2x+cos2x+1
=2sin(2x+π/6)+1
T=2π/2=π
单调递减区间
2kπ+π/2kπ-π/6单调递减区间[kπ-π/6,kπ+2π/3
]