函数f(x)=sin(6分之派减2x)的单调递减区间为?
问题描述：
函数f(x)=sin(6分之派减2x)的单调递减区间为?
答
f(x)=-sin(2x-π/6)
f(x)的递减区间是sin(2x-π/6)的递增区间
即2x-π/6∈[-π/2+2kπ,π/2+2kπ]
x∈[-π/6+kπ,π/3+kπ],k∈Z