F(x)=3sin(π/3+2x)的递减区间
问题描述：
F(x)=3sin(π/3+2x)的递减区间
答
因为sinx的递减区间为：[π/2+2kπ,3π/2+2kπ](k∈Z)所以sin(x+π/6)的递减区间为[π/3+2kπ,4π/3+2kπ]所以sin2(x+π/6)=sin(2x+π/3)的递减区间为[π/6+kπ,2π/3+kπ]所以F(x)=2sin(π/3+2x)的递减区间为：[π/...