求单调区间y=1/2sin(π/4-2X/3) y=-lsin(X+π/4)

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求单调区间y=1/2sin(π/4-2X/3)y=-lsin(X+π/4)求单调区间y=1/2sin(π/4-2X/3)y=-lsin(X+π/4)求单调区间y=1/2sin(π/4-2X/3)y=-

求单调区间y=1/2sin(π/4-2X/3) y=-lsin(X+π/4)
求单调区间y=1/2sin(π/4-2X/3) y=-lsin(X+π/4)

求单调区间y=1/2sin(π/4-2X/3) y=-lsin(X+π/4)
套公式呀.三角函数外面的数字都不影响单调区间.
sinx的增区间是[2kπ-π/2,2kπ+π/2],k∈Z
减区间是[2kπ+π/2,2kπ+3/2π],k∈Z或者减一个2π也行.
2kπ-π/2